[UNIX] Sun Microsystems Solaris ACE_SETACL Integer Signedness DoS



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Sun Microsystems Solaris ACE_SETACL Integer Signedness DoS
------------------------------------------------------------------------


SUMMARY

<http://www.sun.com/software/solaris/> Solaris is a UNIX operating system
developed by Sun Microsystems.

Local exploitation of an integer signedness error in Sun Microsystem's
Solaris could allow attackers to cause a kernel panic, leading to a DoS
condition on the affected computer.

DETAILS

Vulnerable Systems:
* Solaris version 10 on x86 and SPARC architectures.

The facl() system call is used to set access controls on a file. Due to an
improper check on one of the arguments passed to this function, an
attacker can cause the kernel allocate a large amount of memory which
causes a kernel panic.

Exploitation of this vulnerability would most likely result in a DoS
condition on the affected host. However, there are other functions called
by this function that use the result of the multiplication performed to
allocate memory. On a 64 bit kernel with several gigabytes of RAM, code
execution may be possible. Fixing this vulnerability will also fix the
later vulnerabilities.

Vendor Status:
Sun Microsystems has addressed this vulnerability by releasing patches.
More information is available from Sun Alert ID 102869 at the following
URL.
<http://sunsolve.sun.com/search/document.do?assetkey=1-26-102869-1>
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102869-1

Disclosure Timeline:
* 11/07/2006 - Initial vendor notification
* 11/10/2006 - Initial vendor response
* 05/07/2007 - Coordinated public disclosure


ADDITIONAL INFORMATION

The information has been provided by iDefense.
The original article can be found at:

<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=524>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=524



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