[ISN] RSI.0002.05-18-98.BNU.UUCPD

From: mea culpa (jerichoat_private)
Date: Tue May 19 1998 - 02:34:03 PDT

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    Forwarded From: RSI Advise <adviseat_private>
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                       Repent Security Incorporated, RSI
                           [ http://www.repsec.com ]
    		       *** RSI ALERT ADVISORY ***
    --- [CREDIT] --------------------------------------------------------------
    Vulnerability found by: Matt Conover <mattat_private>
    Notes: This advisory has been brought to you by WSD;
           RSI's official research & development team. <wsdat_private>
           Webpage: http://www.w00w00.org
    Authors: Matt Conover & Mark Zielinski
    --- [SUMMARY] -------------------------------------------------------------
    Announced:     April 21, 1998
    Report code:   RSI.0002.05-18-98.BNU.UUCPD
    Report title:  BNU uucpd
    Vulnerability: Insufficient bounds checking
    Vendor status: NetBSD:  Contacted, patch information below
    	       OpenBSD: Contacted, patch information below
    	       Solaris: Contacted, awaiting patch information
    Patch status:  Patch available for certain Operating Systems at the end of
    	       this advisory
    Platforms:     OSF 1.0, 2.0,
    	       SunOS 4.1.3, 4.1.4
    	       Solaris 2.2, 2.3, 2.4, 2.5.1
    	       NetBSD 1.3, 1.3.1
    	       OpenBSD 2.1, 2.2
    Not affected:  FreeBSD 2.x
    	       BSDi 2.x, 3.x
    	       RedHat Linux 4.x, 5.x
    	       Slackware Linux 3.x
    Reference:     http://www.repsec.com/advisories.html
    Impact:	       If exploited, an attacker could locally compromise root on
                   your system.
    --- [DETAILS] -------------------------------------------------------------
    Problem:       Upon successfully logging into a system with uucpd,
    	       the daemon will attempt to record wtmp information.
    	       However, due to insufficient bounds checking, a buffer
    	       overflow can result when uucpd attempts to copy the
    	       connecting hostname into a buffer with a predefined size.
    	       While overwriting the buffer, the attacker can manipulate
    	       the stack and execute their own commands, possibly gaining
    	       root access into the system.
    	       The attacker must have an account on the system, which
    	       will allow this to be exploited.
    	       This problem is present in BNU uucpd.  This is not
    	       installed by default on every operating system.
    	       This also may not always run as root.
    	       Known vulnerable Operating Systems include:
    	       OSF 1.0, 2.0,
                   SunOS 4.1.3, 4.1.4
                   Solaris 2.2, 2.3, 2.4, 2.5.1
                   NetBSD 1.3, 1.3.1
                   OpenBSD 2.1, 2.2
    	       Operating Systems not vulnerable:
                   FreeBSD 2.x
                   BSDi 2.x, 3.x
                   RedHat Linux 4.x, 5.x
    	       Slackware Linux 3.x
    	       For more information on this type of attack, point your
    	       web browsers to http://www.repsec.com/bofs.html.
    --- [FIX] -----------------------------------------------------------------
    Solution:      A generic patch has been made publically available by the RSI staff.
    --- [PATCH] ---------------------------------------------------------------
    Solution:      Apply the following patch to uucpd.c:
    --- uucpd.old.c     Thu Feb  6 06:34:45 1997
    +++ uucpd.c    Tue Apr  7 16:37:46 1998
    @@ -300,7 +300,8 @@
                    lseek(f, pw->pw_uid * sizeof(struct lastlog), 0);
    -               strcpy(line, remotehost);
    +               strncpy(line, remotehost, sizeof(line)-1);
                    SCPYN(ll.ll_line, line);
                    SCPYN(ll.ll_host, remotehost);
                    (void) write(f, (char *) &ll, sizeof ll);
    For NetBSD's patch please refer to: http://www.repsec.com/advisory/0002.patch.html
    Repent Security Incorporated (RSI)
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    [ http://www.repsec.com ]
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    Copyright May 1998  RepSec, Inc.
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