CVE-2024-35235

NameCVE-2024-35235
DescriptionOpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.8 and earlier, when starting the cupsd server with a Listen configuration item pointing to a symbolic link, the cupsd process can be caused to perform an arbitrary chmod of the provided argument, providing world-writable access to the target. Given that cupsd is often running as root, this can result in the change of permission of any user or system files to be world writable. Given the aforementioned Ubuntu AppArmor context, on such systems this vulnerability is limited to those files modifiable by the cupsd process. In that specific case it was found to be possible to turn the configuration of the Listen argument into full control over the cupsd.conf and cups-files.conf configuration files. By later setting the User and Group arguments in cups-files.conf, and printing with a printer configured by PPD with a `FoomaticRIPCommandLine` argument, arbitrary user and group (not root) command execution could be achieved, which can further be used on Ubuntu systems to achieve full root command execution. Commit ff1f8a623e090dee8a8aadf12a6a4b25efac143d contains a patch for the issue.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3826-1
Debian Bugs1073002

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cups (PTS)buster2.2.10-6+deb10u6vulnerable
buster (security)2.2.10-6+deb10u10fixed
bullseye2.3.3op2-3+deb11u6vulnerable
bullseye (security)2.3.3op2-3+deb11u2vulnerable
bookworm2.4.2-3+deb12u5vulnerable
trixie2.4.7-3fixed
sid2.4.10-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cupssourcebuster2.2.10-6+deb10u10DLA-3826-1
cupssource(unstable)2.4.7-21073002

Notes

[bookworm] - cups <no-dsa> (Minor issue)
[bullseye] - cups <no-dsa> (Minor issue)
https://www.openwall.com/lists/oss-security/2024/06/11/1
Fixed by: https://github.com/OpenPrinting/cups/commit/a436956f374b0fd7f5da9df482e4f5840fa1c0d2

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