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Sun Microsystems Solaris ACE_SETACL Integer Signedness DoS Vulnerability
iDefense Security Advisory 05.07.07
http://labs.idefense.com/intelligence/vulnerabilities/ May 07, 2007
I. BACKGROUND Solaris is a UNIX operating system developed by Sun Microsystems. More information can be found via the following URL.
II. DESCRIPTION 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.
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.
III. ANALYSIS 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.
IV. DETECTION iDefense has confirmed the existence of this vulnerability in Solaris 10 on x86 and SPARC architectures. It is suspected that earlier versions are also affected.
V. WORKAROUND iDefense is currently unaware of any effective workarounds for this issue.
VI. VENDOR RESPONSE 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
VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.
VIII. DISCLOSURE TIMELINE 11/07/2006 Initial vendor notification 11/10/2006 Initial vendor response 05/07/2007 Coordinated public disclosure
IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous.
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