GLSA 200410-24: MIT krb5: Insecure temporary file use in send-pr.sh

http://security.gentoo.org/

Severity:	normal
Title:	MIT krb5: Insecure temporary file use in send-pr.sh
Date:	10/25/2004
Bugs:	#66359
ID:	200410-24

Synopsis

The send-pr.sh script, included in the mit-krb5 package, is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files with the rights of the user running the utility.

Background

MIT krb5 is the free implementation of the Kerberos network authentication protocol written by the Massachusetts Institute of Technology.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-crypt/mit-krb5	<= 1.3.5	>= 1.3.5-r1	All supported architectures

Description

The send-pr.sh 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 send-pr.sh 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 MIT krb5 users should upgrade to the latest version:

    # emerge sync
    
    # emerge -pv ">=app-crypt/mit-krb5-1.3.4-r1"
    # emerge ">=app-crypt/mit-krb5-1.3.4-r1"

References

CAN-2004-0971

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200410-24.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.