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

http://security.gentoo.org/

Severity:	normal
Title:	glibc: Insecure tempfile handling in catchsegv script
Date:	10/21/2004
Bugs:	#66358
ID:	200410-19

Synopsis

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.

Background

glibc is a package that contains the GNU C library.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-libs/glibc	<= 2.3.4.20040808	>= 2.2.5-r9	All supported architectures

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

CAN-2004-0968

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200410-19.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.