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glibc: Insecure tempfile handling in catchsegv script


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200410-19 / glibc
Release Date October 21, 2004
Latest Revision October 21, 2004: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-libs/glibc <= revision >= 2.2.5-r9, revision >= 2.3.2-r12, revision >=, revision >=, >= All supported architectures

Related bugreports: #66358


The catchsegv script in the glibc package is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files with the rights of the user running the script.

2.  Impact Information


glibc is a package that contains the GNU C library.


The catchsegv script creates temporary files in world-writeable directories with predictable names.


A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When catchsegv script is called, this would result in the file being overwritten with the rights of the user running the utility, which could be the root user.

3.  Resolution Information


There is no known workaround at this time.


All glibc users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv sys-libs/glibc
# emerge sys-libs/glibc

4.  References


Page updated October 21, 2004

Summary: This is a Gentoo Linux Security Advisory

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