[UNIX] ssmtp Insecure File Creation

From: SecuriTeam (support_at_securiteam.com)
Date: 05/02/04

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    To: list@securiteam.com
    Date: 2 May 2004 11:27:43 +0200
    
    

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      ssmtp Insecure File Creation
    ------------------------------------------------------------------------

    SUMMARY

     <http://packages.debian.org/stable/mail/ssmtp.html> ssmtp is "A secure,
    effective and simple way of getting mail off a system to your mail hub. It
    contains no suid-binaries or other dangerous things - no mail spool to
    poke around in, and no daemons running in the background. Mail is simply
    forwarded to the configured mailhost. Extremely easy configuration."

    Due to a problem in how ssmtp creates its log file, an attacker is able to
    overwrite any arbitrary file on the system, with privileges equal to those
    of the ssmtp server (usually root).

    DETAILS

    Vulnerable Systems:
     * ssmtp version 2.50.6

    The server creates a log file at /tmp/ssmtp.log, the contents of which can
    be specified by the user. Due to a bug in the code, an attacker is able to
    overwrite files on the target machine.

    The vulnerable call is in log_event:
    #ifdef LOGFILE
            if((fp = fopen("/tmp/ssmtp.log", "a")) != (FILE *)NULL) {
                    (void)fprintf(fp, "%s\\n", buf);
                    (void)fclose(fp);

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:priestmaster@sms.at> Priest.

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