SCO Unixware Setuid 'uidadmin' Scheme Buffer Overflow Vulnerability
iDefense Security Advisory 12.12.05
December 12, 2005
SCO Unixware is a Unix operating system that runs on many OEM platforms.
Local exploitation of a buffer overflow vulnerability in the uidadmin
binary 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 specified file input. If the user prepares a file longer
than 1,600 bytes and supplies the path to that file using the "-S"
option of uidadmin, a stack based buffer overflow occurs. This leads to
the execution of arbitrary code with root privileges, as uidadmin is
setuid root by default.
Successful exploitation of this vulnerability requires that a user have
local access to the system. This would allow the user to gain super user
iDefense has confirmed the existence of this vulnerability in SCO
Unixware versions 7.1.3 and 7.1.4. All previous versions of SCO Unixware
are suspected to be vulnerable.
Remove the setuid bit from the ppp binary:
chmod u-s /unixware/usr/bin/uidadmin
VI. VENDOR RESPONSE
The vendor has released the following update to address this
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2005-3903 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
VIII. DISCLOSURE TIMELINE
10/12/2005 Initial vendor notification
10/13/2005 Initial vendor response
12/12/2005 Coordinated public disclosure
iDefense Labs is credited with the discovery of this vulnerability.
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