CMailServer USER buffer overflow

cmailserver-user-bo (9132) The risk level is classified as HighHigh Risk


CMailServer is vulnerable to a buffer overflow, caused by improper bounds checking of user-supplied arguments by sprint(). By sending passing an overly long USER argument to the server, a remote attacker could overflow a buffer and execute arbitrary code on the server.


Gain Access


Apply the patch for this vulnerability included with the BugTraq Mailing List posting dated May 21 2002 9:49PM. See References.


Platforms Affected:

  • Computalynx CMail Server 2.4.7
  • Youngzsoft CMailServer 3.30


May 21, 2002

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