Hewlett-Packard HP-UX SLSd Arbitrary File Creation Vulnerability
iDefense Security Advisory 02.13.07
Feb 13, 2007
Hewlett-Packard's HP-UX introduced "Single Logical Screen" (SLS) in 1995 to
facilitate using multiple graphics devices on a single desktop. Distributed
SLS, or SLS/d, extends SLS to allow the utilization of graphics devices
within multiple computer systems. More information is available at the
Remote exploitation of a design error within Hewlett-Packard's "SLSd" daemon
could allow an attacker to execute privileges as the superuser.
The problem specifically exists due to a design error within the
"SLSd_daemon" RPC daemon that provides connectivity between the
distributed systems. This daemon registers itself under the RPC PROGID of
536870913 or 351456, depending on the HP-UX version. By sending a
specially crafted request, the daemon will write attacker supplied data to
an arbitrary file as the superuser.
Exploitation allows an unauthenticated attacker to gain superuser
privileges by overwriting select files such as .rhosts, cron scripts, or
other files used for authentication.
iDefense has confirmed the existence of this vulnerability within the
"SLSd_daemon" binary as shipped with HP-UX 11.11i and 10.20. All versions
are suspected to be vulnerable.
Employ firewalls to limit access to the affected system to reduce exposure
to this vulnerability. If you are not using Distrubuted SLS, disable the
VI. VENDOR RESPONSE
Hewlett-Packard has addressed this vulnerabilty with HP Security Advisory
HPSBUX02191. More information is available at the following URL.
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
01/30/2007 Initial vendor notification
01/30/2007 Initial vendor response
02/13/2007 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright =A9 2006 iDefense, Inc.
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