J-Security Center

Title: Atrium Software Mercur Mailserver POP3 AUTH Remote Buffer Overflow Vulnerability

Severity: CRITICAL

Description:

MERCUR Mailserver is a commercially available mail software solution distributed and maintained by Atrium Software International. It is available for the Microsoft Windows platform.

A problem has been reported in MERCUR Mailserver when handling the POP3 AUTH command. This problem may make it possible for an attacker crash the service on a vulnerable system.

The problem is in the handling of long arguments to the AUTH command. When a string of excessive length is supplied to the AUTH command via the PLAIN option, the process becomes unstable. This is due to a boundary condition error in the base64 decoding routine.

It is possible for an attacker to exploit this issue to execute arbitrary instructions. Any instructions executed on a vulnerable host would be executed with the privileges of the POP3 server process, which in a typical implementation may execute with SYSTEM privileges.

Affected Products:

  • Atrium Software MERCUR Mailserver 3.3.0
  • Atrium Software MERCUR Mailserver 3.3.0 SP1
  • Atrium Software MERCUR Mailserver 3.3.0 SP2
  • Atrium Software MERCUR Mailserver 4.0.01
  • Atrium Software MERCUR Mailserver 4.0.01 SP1
  • Atrium Software MERCUR Mailserver 4.2.0
  • Atrium Software MERCUR Mailserver 4.2.0SP1
  • Atrium Software MERCUR Mailserver 4.2.0SP2

References:

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