csaf_redhat - rhsa-2025:12111

rhsa-2025:12111

Vulnerability from csaf_redhat

Published

2025-07-29 13:44

Modified

2025-08-04 21:20

Summary

Red Hat Security Advisory: libtpms security update

Notes

Topic

An update for libtpms is now available for Red Hat Enterprise Linux 9.4 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details

The libtpms is a library providing Trusted Platform Module (TPM) functionality for virtual machines. Security Fix(es): * libtpms: Libtpms Out-of-Bounds Read Vulnerability (CVE-2025-49133) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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        "text": "An update for libtpms is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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        "text": "The libtpms is a library providing Trusted Platform Module (TPM) functionality for virtual machines.\n\nSecurity Fix(es):\n\n* libtpms: Libtpms Out-of-Bounds Read Vulnerability (CVE-2025-49133)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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  "vulnerabilities": [
    {
      "cve": "CVE-2025-49133",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2025-06-10T20:01:06.628392+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2371585"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libtpms. A heap buffer overflow can occur in the `tpms_parse_pssh` function when parsing a malformed Public Signature Key Exchange (PSK) structure. A local attacker can trigger this overflow by providing a crafted PSK structure to the library. This can lead to a denial of service or allow for arbitrary code execution.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libtpms: Libtpms Out-of-Bounds Read Vulnerability",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability, identified as a potential out-of-bounds read, is triggered by inconsistent parameters within the CryptHmacSign function of the vTPM (virtual Trusted Platform Module). Although the attack is local to the system, it requires user interaction in the form of sending malicious commands to the vTPM. The primary impact is a denial-of-service (DoS) to the virtual machine (VM) by rendering its vTPM unavailable. This prevents the VM from utilizing critical TPM functionality, which can lead to significant operational disruption. While this flaw does not enable arbitrary code execution, the potential for DoS and broader system instability justifies a Moderate severity rating. The requirement for specific user interaction reduces its severity from what would otherwise be an Important classification.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-49133"
        },
        {
          "category": "external",
          "summary": "RHBZ#2371585",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2371585"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-49133",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-49133"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-49133",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49133"
        },
        {
          "category": "external",
          "summary": "https://github.com/stefanberger/libtpms/commit/04b2d8e9afc0a9b6bffe562a23e58c0de11532d1",
          "url": "https://github.com/stefanberger/libtpms/commit/04b2d8e9afc0a9b6bffe562a23e58c0de11532d1"
        },
        {
          "category": "external",
          "summary": "https://github.com/stefanberger/libtpms/security/advisories/GHSA-25w5-6fjj-hf8g",
          "url": "https://github.com/stefanberger/libtpms/security/advisories/GHSA-25w5-6fjj-hf8g"
        },
        {
          "category": "external",
          "summary": "https://trustedcomputinggroup.org/resource/tpm-library-specification",
          "url": "https://trustedcomputinggroup.org/resource/tpm-library-specification"
        },
        {
          "category": "external",
          "summary": "https://trustedcomputinggroup.org/wp-content/uploads/TPM-2.0-1.83-Part-4-Supporting-Routines-Code.pdf",
          "url": "https://trustedcomputinggroup.org/wp-content/uploads/TPM-2.0-1.83-Part-4-Supporting-Routines-Code.pdf"
        }
      ],
      "release_date": "2025-06-10T19:46:27.397000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2025-07-29T13:44:09+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:12111"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H",
            "version": "3.1"
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          ]
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libtpms: Libtpms Out-of-Bounds Read Vulnerability"
    }
  ]
}

CVE-2025-49133 (GCVE-0-2025-49133)

Vulnerability from cvelistv5

Published

2025-06-10 19:46

Modified

2025-06-10 20:01

Severity ?

5.9 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read

Summary

Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the ‘CryptHmacSign’ function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the ‘CryptHmacSign’ function, which is defined in the "Part 4: Supporting Routines – Code" document, section "7.151 - /tpm/src/crypt/CryptUtil.c ". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example making a vTPM (swtpm) unavailable to a VM. This vulnerability is fixed in 0.7.12, 0.8.10, 0.9.7, and 0.10.1.

References

►

URL

	Vendor	Product	Version
	stefanberger	libtpms	Version: = 0.7.11 Version: = 0.8.9 Version: = 0.9.6 Version: = 0.10.0

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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