CVE-2021-31535

Katalog CVE

CVSS 9.8 · Critical EPSS 10,6%

Kerentanan Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') pada x.org libx11, x.org x window system +1 lainnya. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

27 Mei 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

EPSS (30 hari)

10,6% peluang dieksploitasi; lebih tinggi dari 95,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://lists.x.org/archives/xorg-announce/2021-May/003088.html advisory vendor
• http://packetstormsecurity.com/files/162737/libX11-Insufficient-Length-Check-Injection.html exploit · advisory pihak ketiga · vdb entry
• http://seclists.org/fulldisclosure/2021/May/52 mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2021/05/18/2 mailing list · advisory pihak ketiga
• https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/8d2e02ae650f00c4a53deb625211a0527126c605 advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2021/05/msg00021.html advisory pihak ketiga
• https://lists.freedesktop.org/archives/xorg/ advisory pihak ketiga
• https://security.gentoo.org/glsa/202105-16 advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210813-0001/ advisory pihak ketiga
• https://unparalleled.eu/blog/2021/20210518-using-xterm-to-navigate-the-huge-color-space/ exploit · advisory pihak ketiga
• https://unparalleled.eu/publications/2021/advisory-unpar-2021-1.txt exploit · advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4920 advisory pihak ketiga
• https://www.openwall.com/lists/oss-security/2021/05/18/2 mailing list · advisory pihak ketiga
• https://www.openwall.com/lists/oss-security/2021/05/18/3 mailing list · advisory pihak ketiga
• https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka....
• https://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafk...
• https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka....
• https://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafk...
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEOT4RLB76RVP...