iDEFENSE Security Advisory 10.24.05: SCO Unixware Setuid ppp prompt Buffer Overflow Vulnerability
From: iDEFENSE Labs (labs-no-reply_at_idefense.com)
Date: Mon, 24 Oct 2005 18:51:26 -0400 To: <email@example.com>, <firstname.lastname@example.org>, <email@example.com>
SCO Unixware Setuid ppp prompt Buffer Overflow Vulnerability
iDEFENSE Security Advisory 10.24.05
October 24, 2005
SCO UnixWare is a UNIX operating system.
More information is available at:
Local exploitation of a buffer overflow vulnerability in the ppp binary,
as included in multiple versions of The SCO Group Inc.'s Unixware,
allows attackers to gain root privileges.
The vulnerability specifically exists because of a failure to check the
length of user input. If the user running the ppp program enters an
argument to the "prompt" or "defprompt" command that exceeds 256 bytes
length, a stack based overflow occurs. This leads to the execution of
arbitrary code with root privileges, as ppp is setuid root by default.
Successful exploitation of this vulnerability requires that user have
local access to the system; it would allow the user to gain superuser
iDEFENSE has confirmed the existence of this vulnerability in SCO
Unixware versions 7.1.3 and 7.1.4. All versions of SCO Unixware are
suspected to be vulnerable.
As a workaround solution, remove the setuid bit from the backupsh binary
until a vendor patch can be applied.
# chmod u-s /usr/bin/ppp
VI. VENDOR RESPONSE
The vendor has released the following advisory for this issue:
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2005-2927 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
VIII. DISCLOSURE TIMELINE
09/08/2005 Initial vendor notification
09/09/2005 Initial vendor response
10/24/2005 Public disclosure
iDEFENSE Labs is credited with the discovery of this vulnerability.
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X. LEGAL NOTICES
Copyright (c) 2005 iDEFENSE, Inc.
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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
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