glibc: Insecure tempfile handling in catchsegv script — GLSA 200410-19

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.

Affected Packages

sys-libs/glibc on all architectures
Affected versions <= 2.3.4.20040808
Unaffected versions revision >= 2.2.5-r9, revision >= 2.3.2-r12, revision >= 2.3.3.20040420-r2, revision >= 2.3.4.20040619-r2, >= 2.3.4.20040808-r1

Background

glibc is a package that contains the GNU C library.

Description

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

Impact

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.

Workaround

There is no known workaround at this time.

Resolution

All glibc users should upgrade to the latest version:

 # emerge sync

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

References

Release Date
October 21, 2004

Latest Revision
October 21, 2004: 01

Severity
normal

Exploitable
local

Bugzilla entries