GLSA-200501-02 : a2ps: Multiple vulnerabilities
Critical Nessus Plugin ID 16393
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200501-02 (a2ps: Multiple vulnerabilities)
Javier Fernandez-Sanguino Pena discovered that the a2ps package contains two scripts that create insecure temporary files (fixps and psmandup). Furthermore, we fixed in a previous revision a vulnerability in a2ps filename handling (CAN-2004-1170).
A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When fixps or psmandup is executed, this would result in the file being overwritten with the rights of the user running the utility. By enticing a user or script to run a2ps on a malicious filename, an attacker could execute arbitrary commands on the system with the rights of that user or script.
There is no known workaround at this time.
SolutionAll a2ps users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=app-text/a2ps-4.13c-r2'