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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 10.6%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 10.63% probability · 96th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-120
- Affected
- x.org/libx11 · x.org/x window system · fedoraproject/fedora
- Source
- cve@mitre.org
References
- http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/May/52Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/18/2Mailing List, Third Party Advisory
- https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605Third Party Advisory
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/05/msg00021.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/
- https://lists.freedesktop.org/archives/xorg/Third Party Advisory
- https://lists.x.org/archives/xorg-announce/2021-May/003088.htmlVendor Advisory
- https://security.gentoo.org/glsa/202105-16Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210813-0001/Third Party Advisory
- https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/Exploit, Third Party Advisory
- https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txtExploit, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4920Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/05/18/2Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/05/18/3Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/May/52Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/18/2Mailing List, Third Party Advisory
- https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605Third Party Advisory
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2021/05/msg00021.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVPJQKGGTIKTBIOLHX2NR6/
- https://lists.freedesktop.org/archives/xorg/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.