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MIT krb5: Insecure temporary file use in


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200410-24 / mit-krb5
Release Date October 25, 2004
Latest Revision January 30, 2005: 02
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-crypt/mit-krb5 <= 1.3.5 >= 1.3.5-r1, revision >= 1.3.4-r1 All supported architectures

Related bugreports: #66359


The 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.

2.  Impact Information


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


The 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 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.

3.  Resolution Information


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"

4.  References


Page updated October 25, 2004

Summary: This is a Gentoo Linux Security Advisory

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