QID 670898

QID 670898: EulerOS Security Update for libX11 (EulerOS-SA-2021-2558)

Core X11 protocol client library. Security Fix(es): LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.(CVE-2021-31535)
Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

An arbitrary attacker may exploit this vulnerability to compromise the system.

  • CVSS V3 rated as Critical - 9.8 severity.
  • CVSS V2 rated as High - 7.5 severity.
    • Solution
    The Vendor has released a security update to fix the vulnerability. For more information please visit EulerOS-SA-2021-2558 for updates and patch information
    Vendor References

    CVEs related to QID 670898

    CVE-2021-31535 |
    Software Advisories
    Advisory ID Software Component Link
    EulerOS-SA-2021-2558 EulerOS V2.0SP9 URL Logo developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2021-2558
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