[UNIX] Unofficial Patch for Qmail Crash After Long SMTP Session

From: SecuriTeam (support_at_securiteam.com)
Date: 01/22/04

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Date: 22 Jan 2004 18:02:28 +0200

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      Unofficial Patch for Qmail Crash After Long SMTP Session
    ------------------------------------------------------------------------

    SUMMARY

    As reported, Qmail suffers from a vulnerability which allows a remote user
    to crash the qmail daemon. For more details see:
    <http://www.securiteam.com/unixfocus/5QP0D2ABPQ.html> Qmail Crash and
    Memory Overwrite After Long SMTP Session
    Below is an unofficial patch which mitigates the problem.

    DETAILS

    --- qmail-smtpd.c Mon Jun 15 13:53:16 1998
    +++ qmail-smtpd-patched.c Mon Jan 19 15:22:23 2004
    @@ -316,8 +316,8 @@
             if (flagmaybex) if (pos == 7) ++*hops;
             if (pos < 2) if (ch != "\r\n"[pos]) flagmaybey = 0;
             if (flagmaybey) if (pos == 1) flaginheader = 0;
    + ++pos;
           }
    - ++pos;
           if (ch == '\n') { pos = 0; flagmaybex = flagmaybey = flagmaybez =
    1; }
         }
         switch(state) {

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:aanton@reversedhell.net>
    Anton Alin-Adrian

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