MIT krb5: Insecure temporary file use in send-pr.sh
Gentoo Linux Security Advisory
||GLSA 200410-24 / mit-krb5
||October 25, 2004
||January 30, 2005: 02
All supported architectures
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.
MIT krb5 is the free implementation of the Kerberos network
authentication protocol written by the Massachusetts Institute of
The send-pr.sh 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
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
There is no known workaround at this time.
All MIT krb5 users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=app-crypt/mit-krb5-1.3.4-r1"
# emerge ">=app-crypt/mit-krb5-1.3.4-r1"