CVE-2021-31535
CVSS v3
9.8
CRITICAL
Score EPSS
2.1 %
probabilité d’exploitation
CISA KEV
Non
exploitation connue
Exploitation
—
statut SSVC
Description
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.
Détails techniques
- Publiée le
- 2021-05-27
Questions fréquentes
Qu’est-ce que 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.
CVE-2021-31535 est-elle activement exploitée ?
Aucune exploitation active de CVE-2021-31535 n’est confirmée. Le score EPSS est de 2.1 %, soit la probabilité estimée d’exploitation dans les 30 prochains jours.
Quel est le score CVSS de CVE-2021-31535 ?
CVE-2021-31535 a un score de base CVSS v3 de 9.8 (gravité CRITICAL).
CVE-2021-31535 touche-t-elle votre environnement ?
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Classées par probabilité d’exploitation (EPSS).