From: Slackware Security Team <security@slackware.com>
To: slackware-security@slackware.com
Subject: [slackware-security] zsh (SSA:2025-109-01)
Date: Sat, 19 Apr 2025 12:32:51 -0700 (PDT)





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[slackware-security] zsh (SSA:2025-109-01)

New zsh packages are available for Slackware 15.0 to fix a security issue.


Here are the details from the Slackware 15.0 ChangeLog:
+--------------------------+
patches/packages/zsh-5.9-i586-1_slack15.0.txz: Upgraded.
This release fixes a security issue in zsh-5.8:
Some prompt expansion sequences, such as %F, support 'arguments' which are
themselves expanded in case they contain colour values, etc. This additional
expansion would trigger PROMPT_SUBST evaluation, if enabled. This could be
abused to execute code the user didn't expect. e.g., given a certain prompt
configuration, an attacker could trick a user into executing arbitrary code
by having them check out a Git branch with a specially crafted name.
This is fixed in the shell itself by no longer performing PROMPT_SUBST
evaluation on these prompt-expansion arguments.
Note that this is a potential incompatibilty if you are relying
on the previous behavior of PROMPT_SUBST.
Thanks to pblsxw for the heads-up on this.
For more information, see:
https://www.cve.org/CVERecord?id=CVE-2021-45444
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project! :-)

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/zsh-5.9-i586-1_slack15.0.txz

Updated package for Slackware x86_64 15.0:
ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/zsh-5.9-x86_64-1_slack15.0.txz


MD5 signatures:
+-------------+

Slackware 15.0 package:
061804a8d52ec3c1492bda4f05748fea zsh-5.9-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
3d0b84ddbbeedf0d346ef1819bb29e32 zsh-5.9-x86_64-1_slack15.0.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg zsh-5.9-i586-1_slack15.0.txz


+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com

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