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MIT Kerberos 5: Multiple vulnerabilities

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200507-11 / mit-krb5
Release Date July 12, 2005
Latest Revision July 12, 2005: 01
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-crypt/mit-krb5 < 1.4.1-r1 >= 1.4.1-r1 All supported architectures

Related bugreports: #98799

Synopsis

MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote execution of arbitrary code, possibly leading to the compromise of the entire Kerberos realm.

2.  Impact Information

Background

MIT Kerberos 5 is the free implementation of the Kerberos network authentication protocol by the Massachusetts Institute of Technology.

Description

Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the heap by freeing unallocated memory when receiving a special TCP request (CAN-2005-1174). He also discovered that the same request could lead to a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered that krb5_recvauth() function of MIT Kerberos 5 might try to double-free memory (CAN-2005-1689).

Impact

Although exploitation is considered difficult, a remote attacker could exploit the single-byte heap overflow and the double-free vulnerability to execute arbitrary code, which could lead to the compromise of the whole Kerberos realm. A remote attacker could also use the heap corruption to cause a Denial of Service.

3.  Resolution Information

Workaround

There are no known workarounds at this time.

Resolution

All MIT Kerberos 5 users should upgrade to the latest available version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.4.1-r1"

4.  References



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Page updated July 12, 2005

Summary: This is a Gentoo Linux Security Advisory

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