Heimdal: ftpd root escalation

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-crypt/heimdal	< 0.6.3	>= 0.6.3	All supported architectures

Related bugreports: #61412

Several bugs exist in the Heimdal ftp daemon which could allow a remote attacker to gain root privileges.

2. Impact Information

Heimdal is an implementation of Kerberos 5.

Przemyslaw Frasunek discovered several flaws in lukemftpd, which also apply to Heimdal ftpd's out-of-band signal handling code.

Additionally, a potential vulnerability that could lead to Denial of Service by the Key Distribution Center (KDC) has been fixed in this version.

A remote attacker could be able to run arbitrary code with escalated privileges, which can result in a total compromise of the server.

3. Resolution Information

There is no known workaround at this time.

All Heimdal users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=app-crypt/heimdal-0.6.3"
# emerge ">=app-crypt/heimdal-0.6.3"

4. References

Page updated September 16, 2004

Summary: This is a Gentoo Linux Security Advisory

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