[UNIX] Format String Vulnerability In GNATS

From: SecuriTeam (support_at_securiteam.com)
Date: 06/28/04

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Date: 28 Jun 2004 16:10:15 +0200

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      Format String Vulnerability In GNATS
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.gnu.org/software/gnats/> GNU GNATS is a set of tools for
    tracking bugs reported by users to a central site. It allows problem
    report management and communication with users via various means. GNATS
    stores all the information about problem reports in its databases and
    provides tools for querying, editing, and maintenance of the databases. A
    format string bug has been discovered in the Gnats package that could
    possibly be exploited to execute arbitrary commands.

    DETAILS

    Vulnerable Systems:
     * GNATS Version 4.0 (Prior versions might be also affected)

    Vulnerable Code:
    From gnats-4.0\gnats\misc.c line 94 and on:

    #ifdef HAVE_SYSLOG_H
    case SYSLOG:
    syslog (severity, buf);
    break;
    #endif

    In order to be able to exploit this vulnerability, GNATS should direct
    it's logging to syslog (the default behavior of GNATS if not being called
    from command line and no log file was specified.

    Workaround:
    Replace the call to syslog to something similar to:
    syslog (severity, "%s", buf);

    Vendor Status:
    The Gnats team has been notified of the findings. No patch is available at
    this time.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:shirani@zone-h.org> Khan
    Shirani.

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