MIT Kerberos 5: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200709-01 / mit-krb5
Release Date	September 11, 2007
Latest Revision	September 11, 2007: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-crypt/mit-krb5	< 1.5.3-r1	>= 1.5.3-r1	All supported architectures

Related bugreports: #191301

Synopsis

Two vulnerabilites have been found in MIT Kerberos 5, which could allow a remote unauthenticated user to execute arbitrary code with root privileges.

2. Impact Information

Background

MIT Kerberos 5 is a suite of applications that implement the Kerberos network protocol. kadmind is the MIT Kerberos 5 administration daemon.

Description

A stack buffer overflow (CVE-2007-3999) has been reported in svcauth_gss_validate() of the RPC library of kadmind. Another vulnerability (CVE-2007-4000) has been found in kadm5_modify_policy_internal(), which does not check the return values of krb5_db_get_policy() correctly.

Impact

The RPC related vulnerability can be exploited by a remote unauthenticated attacker to execute arbitrary code with root privileges on the host running kadmind. The second vulnerability requires the remote attacker to be authenticated and to have "modify policy" privileges. It could then also allow for the remote execution of arbitrary code.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.5.3-r1"

4. References

Updated September 11, 2007

Summary: This is a Gentoo Linux Security Advisory

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