CVE-2021-31535
libx11 - security update
描述
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.
如何修補 CVE-2021-31535
要修補 CVE-2021-31535,請將受影響套件升級到下列已修補版本。
- —升級至 1.6.12-r1 或更新版本
- —升級至 2:1.7.1-1 或更新版本
- —升級至 2:1.6.4-3+deb9u4 或更新版本
- —升級至 2:1.6.7-1+deb10u2 或更新版本
CVE-2021-31535 正在被利用嗎?
中等 — EPSS 為 10.6%,可持續追蹤但非最高優先。
受影響套件(4)
- from 0, < 1.6.12-r1
- from 0, < 2:1.7.1-1
- from 0, < 2:1.6.4-3+deb9u4
- from 0, < 2:1.6.7-1+deb10u2
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |