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Texinfo: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200510-04 / Texinfo
Release Date October 05, 2005
Latest Revision October 05, 2005: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-apps/texinfo < 4.8-r1 >= 4.8-r1 All supported architectures

Related bugreports: #106105


Texinfo is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.

2.  Impact Information


Texinfo is the official documentation system created by the GNU project.


Frank Lichtenheld has discovered that the "sort_offline()" function in texindex insecurely creates temporary files with predictable filenames.


A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When texindex is executed, this would result in the file being overwritten with the rights of the user running the application.

3.  Resolution Information


There is no known workaround at this time.


All Texinfo users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/texinfo-4.8-r1"

4.  References


Page updated October 05, 2005

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