Vulnerabilites related to matrix - software_development_kit
Vulnerability from fkie_nvd
Published
2022-09-28 21:15
Modified
2024-11-21 07:17
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-ios-sdk implementing a too permissive key forwarding strategy. The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262cPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4Third Party Advisory
security-advisories@github.comhttps://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262cPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
Impacted products
Vendor Product Version
matrix software_development_kit *


To clipboard 

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              "criteria": "cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:iphone_os:*:*",
              "matchCriteriaId": "D8936990-DFEF-443C-B860-E38726590804",
              "versionEndExcluding": "0.23.19",
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  "descriptions": [
    {
      "lang": "en",
      "value": "Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-ios-sdk implementing a too permissive key forwarding strategy. The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround."
    },
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      "lang": "es",
      "value": "Matrix iOS SDK permite a los desarrolladores crear aplicaciones para iOS compatibles con Matrix. En versiones anteriores a 0.23.19, un atacante que colabore con un servidor dom\u00e9stico malicioso puede construir mensajes que parezcan proceder de otra persona. Dichos mensajes estar\u00e1n marcados con un escudo gris en algunas plataformas, pero \u00e9ste puede faltar en otras. Este ataque es posible debido a que el matrix-ios-sdk implementa una estrategia de reenv\u00edo de claves demasiado permisiva. La pol\u00edtica por defecto para aceptar reenv\u00edos de claves se ha hecho m\u00e1s estricta en matrix-ios-sdk versi\u00f3n 0.23.19. matrix-ios-sdk ahora s\u00f3lo aceptar\u00e1 claves reenviadas en respuesta a peticiones previamente emitidas y s\u00f3lo desde dispositivos propios y verificados. El SDK ahora establece un flag \"trusted\" en el mensaje descifrado al descifrarlo, bas\u00e1ndose en si la clave usada para descifrar el mensaje fue recibida de una fuente confiable. Los clientes deben asegurarse de que los mensajes descifrados con una clave con \"trusted = false\" sean decorados apropiadamente (por ejemplo, mostrando una advertencia para tales mensajes). Este ataque requiere la coordinaci\u00f3n entre un servidor dom\u00e9stico malicioso y un atacante, por lo que aquellos que conf\u00edan en sus servidores dom\u00e9sticos no necesitan una mitigaci\u00f3n"
    }
  ],
  "id": "CVE-2022-39257",
  "lastModified": "2024-11-21T07:17:53.680",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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  "published": "2022-09-28T21:15:14.397",
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      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c"
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      "source": "security-advisories@github.com",
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      "tags": [
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      "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients"
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  "vulnStatus": "Modified",
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}

Vulnerability from fkie_nvd
Published
2022-09-28 20:15
Modified
2024-11-21 07:17
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17ePatch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3mMitigation, Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-spec-proposals/pull/3061Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17ePatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-2pvj-p485-cp3mMitigation, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-spec-proposals/pull/3061Patch, Third Party Advisory
Impacted products
Vendor Product Version
matrix software_development_kit *


To clipboard 

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              "versionEndExcluding": "1.5.1",
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      "value": "matrix-android-sdk2 es el SDK de Matrix para Android. En versiones anteriores a 1.5.1, un atacante que coopere con un servidor dom\u00e9stico malicioso puede construir mensajes que parezcan proceder de otra persona. Dichos mensajes estar\u00e1n marcados con un escudo gris en algunas plataformas, pero \u00e9ste puede faltar en otras. Este ataque es posible debido a una estrategia de reenv\u00edo de claves implementada en el matrix-android-sdk2 que es demasiado permisiva. A partir de la versi\u00f3n 1.5.1, la pol\u00edtica por defecto para aceptar reenv\u00edos de claves es hecho m\u00e1s estricta en matrix-android-sdk2. El matrix-android-sdk2 ahora s\u00f3lo aceptar\u00e1 claves reenviadas en respuesta a peticiones previamente emitidas y s\u00f3lo de dispositivos propios y verificados. El SDK ahora establece un flag de \"trusted\" en el mensaje descifrado al descifrarlo, bas\u00e1ndose en si la clave usada para descifrar el mensaje fue recibida de una fuente confiable. Los clientes deben asegurarse de que los mensajes descifrados con una clave con \"trusted = false\" sean decorados apropiadamente (por ejemplo, mostrando una advertencia para tales mensajes). Como mitigaci\u00f3n, los usuarios actuales del SDK pueden deshabilitar el reenv\u00edo de claves en sus forks usando \"CryptoService#enableKeyGossiping(enable: Boolean)\""
    }
  ],
  "id": "CVE-2022-39246",
  "lastModified": "2024-11-21T07:17:52.157",
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
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        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
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        "type": "Secondary"
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        "impactScore": 1.4,
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  "published": "2022-09-28T20:15:14.160",
  "references": [
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      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17e"
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      "source": "security-advisories@github.com",
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Vulnerability from fkie_nvd
Published
2022-09-28 20:15
Modified
2024-11-21 07:17
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. matrix-android-sdk2 would then additionally sign such a key backup with its device key, spilling trust over to other devices trusting the matrix-android-sdk2 device. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-android-sdk2 version 1.5.1 has been modified to only accept Olm-encrypted to-device messages and to stop signing backups on a successful decryption. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17ePatch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-fpgf-pjjv-2qgmPatch, Third Party Advisory
security-advisories@github.comhttps://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-android-sdk2/commit/77df720a238d17308deab83ecaa37f7a4740a17ePatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.5.1Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-android-sdk2/security/advisories/GHSA-fpgf-pjjv-2qgmPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
Impacted products
Vendor Product Version
matrix software_development_kit *


To clipboard 

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    },
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      "value": "matrix-android-sdk2 es el SDK de Matrix para Android. Versiones anteriores a 1.5.1, un atacante que coopere con un servidor dom\u00e9stico malicioso puede construir mensajes que parezcan leg\u00edtimamente proceder de otra persona, sin ninguna indicaci\u00f3n como un escudo gris. Adem\u00e1s, un atacante sofisticado que coopere con un servidor dom\u00e9stico malicioso podr\u00eda emplear esta vulnerabilidad para llevar a cabo un ataque dirigido con el fin de enviar mensajes falsos al dispositivo que parezcan proceder de otro usuario. Esto puede permitir, por ejemplo, inyectar el secreto de la copia de seguridad de la clave durante una autoverificaci\u00f3n, para hacer que un dispositivo objetivo comience a usar una copia de seguridad de la clave maliciosa falsificada por el servidor dom\u00e9stico. matrix-android-sdk2 firmar\u00eda entonces adicionalmente dicha copia de seguridad de la clave con su clave de dispositivo, derramando la confianza sobre otros dispositivos que conf\u00edan en el dispositivo matrix-android-sdk2. Estos ataques son posibles debido a una vulnerabilidad de confusi\u00f3n del protocolo que acepta mensajes to-device encriptados con Megolm en lugar de Olm. matrix-android-sdk2 versi\u00f3n 1.5.1 ha sido modificada para que s\u00f3lo acepte mensajes to-device encriptados con Olm y para que deje de firmar las copias de seguridad en caso de una desencriptaci\u00f3n con \u00e9xito. Por precauci\u00f3n, han sido auditadas o a\u00f1adidas otras comprobaciones. Este ataque requiere la coordinaci\u00f3n entre un servidor dom\u00e9stico malicioso y un atacante, por lo que aquellos que conf\u00edan en sus servidores dom\u00e9sticos no necesitan una mitigaci\u00f3n"
    }
  ],
  "id": "CVE-2022-39248",
  "lastModified": "2024-11-21T07:17:52.300",
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Vulnerability from fkie_nvd
Published
2022-09-28 21:15
Modified
2024-11-21 07:17
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-ios-sdk version 0.23.19 has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched.
References
security-advisories@github.comhttps://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262cPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcmThird Party Advisory
security-advisories@github.comhttps://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262cPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcmThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clientsVendor Advisory
Impacted products
Vendor Product Version
matrix software_development_kit *


To clipboard 

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  "id": "CVE-2022-39255",
  "lastModified": "2024-11-21T07:17:53.367",
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CVE-2022-39257 (GCVE-0-2022-39257)
Vulnerability from cvelistv5
Published
2022-09-28 20:55
Modified
2025-04-23 16:54
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-287 - Improper Authentication
Summary
Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-ios-sdk implementing a too permissive key forwarding strategy. The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.
References
Impacted products
Vendor Product Version
matrix-org matrix-ios-sdk Version: < 0.23.19
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2022-39248 (GCVE-0-2022-39248)
Vulnerability from cvelistv5
Published
2022-09-28 20:05
Modified
2025-04-23 16:54
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-287 - Improper Authentication
Summary
matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. matrix-android-sdk2 would then additionally sign such a key backup with its device key, spilling trust over to other devices trusting the matrix-android-sdk2 device. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-android-sdk2 version 1.5.1 has been modified to only accept Olm-encrypted to-device messages and to stop signing backups on a successful decryption. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.
References
Impacted products
Vendor Product Version
matrix-org matrix-android-sdk2 Version: < 1.5.1
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2022-39255 (GCVE-0-2022-39255)
Vulnerability from cvelistv5
Published
2022-09-28 20:35
Modified
2025-04-23 16:54
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-287 - Improper Authentication
Summary
Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-ios-sdk version 0.23.19 has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched.
References
Impacted products
Vendor Product Version
matrix-org matrix-ios-sdk Version: < 0.23.19
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2022-39246 (GCVE-0-2022-39246)
Vulnerability from cvelistv5
Published
2022-09-28 20:00
Modified
2025-04-23 16:54
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-287 - Improper Authentication
Summary
matrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`.
References
Impacted products
Vendor Product Version
matrix-org matrix-android-sdk2 Version: < 1.5.1
 Create a notification for this product.
Show details on NVD website

To clipboard 

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