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Gentoo Linux Security Advisory 202211-09

Gentoo Linux Security Advisory 202211-9 - A vulnerability has been found in xterm which could allow for arbitrary code execution. Versions less than 375 are affected.

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Gentoo Linux Security Advisory GLSA 202211-09

                                       https://security.gentoo.org/

Severity: Normal
Title: xterm: Arbitrary Code Execution
Date: November 22, 2022
Bugs: #880747
ID: 202211-09

Synopsis

A vulnerability has been found in xterm which could allow for arbitrary
code execution.

Background

xterm is a terminal emulator for the X Window system.

Affected packages

-------------------------------------------------------------------  
 Package              /     Vulnerable     /            Unaffected  
-------------------------------------------------------------------

1 x11-terms/xterm < 375 >= 375

Description

xterm does not correctly handle control characters related to OSC 50
font ops sequence handling.

Impact

The vulnerability allows text written to the terminal to write text to
the terminal’s command line. If the terminal’s shell is zsh running with
vi line editing mode, text written to the terminal can also trigger the
execution of arbitrary commands via writing ^G to the terminal.

Workaround

As a workaround, users can disable xterm’s usage of OSC 50 sequences by
adding the following to the XResources configuration:

XTerm*allowFontOps: false

Resolution

All xterm users should upgrade to the latest version:

emerge --sync

emerge --ask --oneshot --verbose “>=x11-terms/xterm-375”

References

[ 1 ] CVE-2022-45063
https://nvd.nist.gov/vuln/detail/CVE-2022-45063

Availability

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/202211-09

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users’ machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.