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

[GLSA]

Gentoo Linux Security Advisory

Title: MIT krb5: Insecure temporary file use in send-pr.sh (GLSA 200410-24)
Severity: normal
Exploitable: local
Date: October 25, 2004
Updated: January 30, 2005
Bug(s): #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: app-crypt/mit-krb5
Vulnerable: <= 1.3.5
Unaffected: >= 1.3.5-r1
Unaffected: >= 1.3.4-r1 < 1.3.5
Architectures: 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: