Operating systems

Patch critical AFS and Apache flaws in Mac OS X and OS X Server

New OS X holes require prompt action.

Apple has released patches to fix some highly critical vulnerabilities in Mac OS X and Mac OS X Server. These software flaws can allow a remote attacker to completely compromise a system.

Details

Apple's security update 61798 lists a number of issues, including two dated May 3, 2004. Reading the Apple notes on these threats wouldn't raise any alarm bells because they talk about vulnerabilities in a vague and calming tone.

However, security firm @Stake, which discovered some of the most serious flaws and initially warned Apple security, says these are highly critical vulnerabilities. @Stake's own security advisory on these flaws paints a dramatic, and probably more realistic, picture of the threats posed by these flaws, saying they allow a remote attacker to "execute arbitrary commands as root."

The most critical threats lie in the AppleFileServer, which contains a stack buffer overflow vulnerability. These security updates also include patches for Apache 2, CoreFoundation, and IPSec as described by Apple:

  • Security Update 2004-05-03 for Mac OS X 10.3.3 "Panther" and Mac OS X 10.3.3 Server.
  • Security Update 2004-05-03 for Mac OS X 10.2.8 "Jaguar" and Mac OS X 10.2.8 Server.
  • AppleFileServer: Fixes CAN-2004-0430 to improve the handling of long passwords [CRITICAL].
  • Apache 2: Fixes CAN-2003-0020, CAN-2004-0113, and CAN-2004-0174 [mostly a DoS threat].
  • CoreFoundation: Fixes CAN-2004-0428 [undisclosed threat].
  • IPSec: Fixes CAN-2004-0155 and CAN-2004-0403 [VPN tunnel man-in-the-middle attacks].
  • Also note that IPSec in Mac OS X is not vulnerable to CAN-2004-0392.

Applicability—Mac OS X and Mac OS X Server

@Stake reports they have proven these exploits on Mac OS X 10.3.3, 10.3.2, and 10.2.8, but states that in general the threat applies to all versions of Mac OS X 10.3.3 and earlier.

The Apache 2 vulnerabilities apply to versions before 2.0.49.

Risk level—Highly critical

The most severe threat is from the AppleFileServer buffer overrun vulnerability.

Mitigating factors

Apple Filing Protocol is the vulnerable portion of AppleFileServer and it is not enabled by default.

Fix

Apply the patches or disable Apple Filing Protocol if you don't need it.

For the other vulnerabilities, apply the provided patches or, for Apache 2, upgrade to version 2.0.49.

Final word

The most serious vulnerabilities were reported to Apple by @Stake on March 26, 2004, and announced by @Stake on the day Apple released the patches, May 3, 2004.

The other threats were not credited to @Stake. Apple doesn't list any credit for the Apache 2 vulnerability but credits aaron@vtty.com for informing the vendor of the CoreFoundation problem.


Also watch for...

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The Department of Homeland Security has just published "The Incident Response and Reporting Guidelines," a publication covering symptoms and responses for attacks. I couldn't locate a downloadable version but, fear not, the National Institute of Science and Technology (NIST) published a very comprehensive report on exactly the same thing a few months back, and it's in PDF format that you can download.


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