Courier MTA: Denial of Service vulnerability

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
mail-mta/courier	< 0.53.2	>= 0.53.2	All supported architectures

Related bugreports: #135005

Courier MTA has fixed a DoS issue related to usernames containing a "=" character.

2. Impact Information

Courier MTA is an integrated mail and groupware server based on open protocols.

Courier MTA has fixed a security issue relating to usernames containing the "=" character, causing high CPU utilization.

An attacker could exploit this vulnerability by sending a specially crafted email to a mail gateway running a vulnerable version of Courier MTA.

3. Resolution Information

There is no known workaround at this time.

All Courier MTA users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-mta/courier-0.53.2"

4. References

Page updated August 04, 2006

Summary: This is a Gentoo Linux Security Advisory

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