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Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-31535

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.026
EPSS Ranking 84.8%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5
References
Products affected by CVE-2021-31535
  • X.org » Libx11 » Version: N/A
    cpe:2.3:a:x.org:libx11:-
  • X.org » Libx11 » Version: 1.0.1
    cpe:2.3:a:x.org:libx11:1.0.1
  • X.org » Libx11 » Version: 1.0.2
    cpe:2.3:a:x.org:libx11:1.0.2
  • X.org » Libx11 » Version: 1.0.3
    cpe:2.3:a:x.org:libx11:1.0.3
  • X.org » Libx11 » Version: 1.0.99.1
    cpe:2.3:a:x.org:libx11:1.0.99.1
  • X.org » Libx11 » Version: 1.0.99.2
    cpe:2.3:a:x.org:libx11:1.0.99.2
  • X.org » Libx11 » Version: 1.1
    cpe:2.3:a:x.org:libx11:1.1
  • X.org » Libx11 » Version: 1.1.1
    cpe:2.3:a:x.org:libx11:1.1.1
  • X.org » Libx11 » Version: 1.1.2
    cpe:2.3:a:x.org:libx11:1.1.2
  • X.org » Libx11 » Version: 1.1.3
    cpe:2.3:a:x.org:libx11:1.1.3
  • X.org » Libx11 » Version: 1.1.4
    cpe:2.3:a:x.org:libx11:1.1.4
  • X.org » Libx11 » Version: 1.1.5
    cpe:2.3:a:x.org:libx11:1.1.5
  • X.org » Libx11 » Version: 1.1.6
    cpe:2.3:a:x.org:libx11:1.1.6
  • X.org » Libx11 » Version: 1.1.99.1
    cpe:2.3:a:x.org:libx11:1.1.99.1
  • X.org » Libx11 » Version: 1.1.99.2
    cpe:2.3:a:x.org:libx11:1.1.99.2
  • X.org » Libx11 » Version: 1.2
    cpe:2.3:a:x.org:libx11:1.2
  • X.org » Libx11 » Version: 1.2.1
    cpe:2.3:a:x.org:libx11:1.2.1
  • X.org » Libx11 » Version: 1.2.2
    cpe:2.3:a:x.org:libx11:1.2.2
  • X.org » Libx11 » Version: 1.2.99.901
    cpe:2.3:a:x.org:libx11:1.2.99.901
  • X.org » Libx11 » Version: 1.3
    cpe:2.3:a:x.org:libx11:1.3
  • X.org » Libx11 » Version: 1.3.1
    cpe:2.3:a:x.org:libx11:1.3.1
  • X.org » Libx11 » Version: 1.3.2
    cpe:2.3:a:x.org:libx11:1.3.2
  • X.org » Libx11 » Version: 1.3.3
    cpe:2.3:a:x.org:libx11:1.3.3
  • X.org » Libx11 » Version: 1.3.4
    cpe:2.3:a:x.org:libx11:1.3.4
  • X.org » Libx11 » Version: 1.3.5
    cpe:2.3:a:x.org:libx11:1.3.5
  • X.org » Libx11 » Version: 1.3.6
    cpe:2.3:a:x.org:libx11:1.3.6
  • X.org » Libx11 » Version: 1.3.99.901
    cpe:2.3:a:x.org:libx11:1.3.99.901
  • X.org » Libx11 » Version: 1.3.99.902
    cpe:2.3:a:x.org:libx11:1.3.99.902
  • X.org » Libx11 » Version: 1.3.99.903
    cpe:2.3:a:x.org:libx11:1.3.99.903
  • X.org » Libx11 » Version: 1.4.0
    cpe:2.3:a:x.org:libx11:1.4.0
  • X.org » Libx11 » Version: 1.4.1
    cpe:2.3:a:x.org:libx11:1.4.1
  • X.org » Libx11 » Version: 1.4.2
    cpe:2.3:a:x.org:libx11:1.4.2
  • X.org » Libx11 » Version: 1.4.3
    cpe:2.3:a:x.org:libx11:1.4.3
  • X.org » Libx11 » Version: 1.4.4
    cpe:2.3:a:x.org:libx11:1.4.4
  • X.org » Libx11 » Version: 1.4.99.1
    cpe:2.3:a:x.org:libx11:1.4.99.1
  • X.org » Libx11 » Version: 1.4.99.901
    cpe:2.3:a:x.org:libx11:1.4.99.901
  • X.org » Libx11 » Version: 1.4.99.902
    cpe:2.3:a:x.org:libx11:1.4.99.902
  • X.org » Libx11 » Version: 1.5.0
    cpe:2.3:a:x.org:libx11:1.5.0
  • X.org » Libx11 » Version: 1.5.99.901
    cpe:2.3:a:x.org:libx11:1.5.99.901
  • X.org » Libx11 » Version: 1.5.99.902
    cpe:2.3:a:x.org:libx11:1.5.99.902
  • X.org » Libx11 » Version: 1.6.0
    cpe:2.3:a:x.org:libx11:1.6.0
  • X.org » Libx11 » Version: 1.6.1
    cpe:2.3:a:x.org:libx11:1.6.1
  • X.org » Libx11 » Version: 1.6.10
    cpe:2.3:a:x.org:libx11:1.6.10
  • X.org » Libx11 » Version: 1.6.12
    cpe:2.3:a:x.org:libx11:1.6.12
  • X.org » Libx11 » Version: 1.6.2
    cpe:2.3:a:x.org:libx11:1.6.2
  • X.org » Libx11 » Version: 1.6.3
    cpe:2.3:a:x.org:libx11:1.6.3
  • X.org » Libx11 » Version: 1.6.4
    cpe:2.3:a:x.org:libx11:1.6.4
  • X.org » Libx11 » Version: 1.6.5
    cpe:2.3:a:x.org:libx11:1.6.5
  • X.org » Libx11 » Version: 1.6.6
    cpe:2.3:a:x.org:libx11:1.6.6
  • X.org » Libx11 » Version: 1.6.7
    cpe:2.3:a:x.org:libx11:1.6.7
  • X.org » Libx11 » Version: 1.6.8
    cpe:2.3:a:x.org:libx11:1.6.8
  • X.org » Libx11 » Version: 1.6.9
    cpe:2.3:a:x.org:libx11:1.6.9
  • X.org » Libx11 » Version: 1.7.0
    cpe:2.3:a:x.org:libx11:1.7.0
  • Fedoraproject » Fedora » Version: 33
    cpe:2.3:o:fedoraproject:fedora:33
  • X.org » X Window System » Version: N/A
    cpe:2.3:o:x.org:x_window_system:-
  • X.org » X Window System » Version: x11r7.0
    cpe:2.3:o:x.org:x_window_system:x11r7.0
  • X.org » X Window System » Version: x11r7.1
    cpe:2.3:o:x.org:x_window_system:x11r7.1
  • X.org » X Window System » Version: x11r7.2
    cpe:2.3:o:x.org:x_window_system:x11r7.2
  • X.org » X Window System » Version: x11r7.3
    cpe:2.3:o:x.org:x_window_system:x11r7.3
  • X.org » X Window System » Version: x11r7.4
    cpe:2.3:o:x.org:x_window_system:x11r7.4
  • X.org » X Window System » Version: x11r7.5
    cpe:2.3:o:x.org:x_window_system:x11r7.5
  • X.org » X Window System » Version: x11r7.6
    cpe:2.3:o:x.org:x_window_system:x11r7.6
  • X.org » X Window System » Version: x11r7.7
    cpe:2.3:o:x.org:x_window_system:x11r7.7


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