suse-su-2021:14792-1
Vulnerability from csaf_suse
Published
2021-08-24 14:21
Modified
2021-08-24 14:21
Summary
Security update for openssl1

Notes

Title of the patch
Security update for openssl1
Description of the patch
This update for openssl1 fixes the following security issue: - CVE-2021-3712: a bug in the code for printing certificate details could lead to a buffer overrun that a malicious actor could exploit to crash the application, causing a denial-of-service attack. [bsc#1189521]
Patchnames
secsp3-openssl1-14792
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).


To clipboard 

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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-3712",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2021-3712"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING structure which contains a buffer holding the string data and a field holding the buffer length. This contrasts with normal C strings which are repesented as a buffer for the string data which is terminated with a NUL (0) byte. Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL\u0027s own \"d2i\" functions (and other similar parsing functions) as well as any string whose value has been set with the ASN1_STRING_set() function will additionally NUL terminate the byte array in the ASN1_STRING structure. However, it is possible for applications to directly construct valid ASN1_STRING structures which do not NUL terminate the byte array by directly setting the \"data\" and \"length\" fields in the ASN1_STRING array. This can also happen by using the ASN1_STRING_set0() function. Numerous OpenSSL functions that print ASN.1 data have been found to assume that the ASN1_STRING byte array will be NUL terminated, even though this is not guaranteed for strings that have been directly constructed. Where an application requests an ASN.1 structure to be printed, and where that ASN.1 structure contains ASN1_STRINGs that have been directly constructed by the application without NUL terminating the \"data\" field, then a read buffer overrun can occur. The same thing can also occur during name constraints processing of certificates (for example if a certificate has been directly constructed by the application instead of loading it via the OpenSSL parsing functions, and the certificate contains non NUL terminated ASN1_STRING structures). It can also occur in the X509_get1_email(), X509_REQ_get1_email() and X509_get1_ocsp() functions. If a malicious actor can cause an application to directly construct an ASN1_STRING and then process it through one of the affected OpenSSL functions then this issue could be hit. This might result in a crash (causing a Denial of Service attack). It could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext). Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). Fixed in OpenSSL 1.0.2za (Affected 1.0.2-1.0.2y).",
          "title": "CVE description"
        }
      ],
      "product_status": {
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          "summary": "CVE-2021-3712",
          "url": "https://www.suse.com/security/cve/CVE-2021-3712"
        },
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          "summary": "SUSE Bug 1189521 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1189521"
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          "summary": "SUSE Bug 1190129 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1190129"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1191640 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1191640"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1192100 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1192100"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1192787 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1192787"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1194948 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1194948"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1225628 for CVE-2021-3712",
          "url": "https://bugzilla.suse.com/1225628"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2021-08-24T14:21:14Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2021-3712"
    }
  ]
}


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