CVE-2023-3138
libx11 - security update
Description
A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.
How to fix CVE-2023-3138
To remediate CVE-2023-3138, upgrade the affected package to a fixed version below.
- —upgrade to 1.7.3.1-r1 or later
- —upgrade to 2:1.7.2-1+deb11u1 or later
- —upgrade to 2:1.6.7-1+deb10u3 or later
- —upgrade to 2:1.7.2-1+deb11u1 or later
Is CVE-2023-3138 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.7.3.1-r1
- from 0, < 2:1.7.2-1+deb11u1
- from 0, < 2:1.6.7-1+deb10u3
- from 0, < 2:1.7.2-1+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |