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TITLE:
Mac OS X Security Update Fixes Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA16920

VERIFY ADVISORY:
http://secunia.com/advisories/16920/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Cross Site Scripting, Exposure of sensitive
information, Privilege escalation, System access

WHERE:
>From remote

OPERATING SYSTEM:
Apple Macintosh OS X
http://secunia.com/product/96/

DESCRIPTION:
Apple has issued a security update for Mac OS X, which fixes 10
vulnerabilities.

1) A boundary error in ImageIO can be exploited to cause a buffer
overflow and may allow execution of arbitrary code on a user's system
when a specially crafted GIF file is opened e.g. in WebCore or
Safari.

2) An error in Mail.app when processing auto-reply rules can cause an
automatically generated response message to include a plain-text copy
of the encrypted message. This may disclose certain sensitive
information.

3) An error in Mail.app when using Kerberos 5 for SMTP authentication
can cause un-initialized memory to be appended to a message. This may
disclose certain sensitive information. For Mac OS X v10.4.2, the
vulnerability was fixed in Security Update 2005-007.

For more information:
SA16449

4) "malloc" creates diagnostic files insecurely when certain
environmental variables are set to enable debugging of application
memory allocation. This can be exploited by malicious, local users to
create or overwrite arbitrary files.

5) A boundary error in QuickDraw Manager can be exploited to cause a
buffer overflow and may allow arbitrary code execution on a user's
system when a specially crafted PICT file is viewed e.g. from Safari,
Mail, or Finder.

6) A validation error in the Java extensions bundled with QuickTime
6.52 and earlier can be exploited by untrusted applets to call
arbitrary functions from system libraries. Systems with QuickTime 7
or later, or Mac OS X v10.4 or later, are not affected.

7) A vulnerability in Ruby can be exploited by malicious people to
bypass certain security restrictions. Systems prior to Mac OS X v10.4
are not affected.

For more information:
SA15767

8) A validation error in Safari when rendering web archives from a
malicious site can be exploited to execute arbitrary HTML and script
code in a user's browser session in the context of another site. For
Mac OS X v10.4.2, the vulnerability was fixed in Security Update
2005-007.

For more information:
SA16449

9) An error in the SecurityAgent may cause the "Switch User..."
button to be displayed even when the "Enable fast user switching"
setting has been disabled. This may allow malicious, local users to
access the current user's desktop without authentication even when
the "Require password to wake this computer from sleep or screen
saver" setting is enabled.

10) A validation error in the Authorization Services "securityd"
allows unprivileged users to gain certain privileges that should be
restricted to administrative users. This can be exploited by
malicious, local users to gain escalated privileges.

SOLUTION:
Apply Security Update 2005-008.

Mac OS X 10.3.9:
http://www.apple.com/support/downloads/securityupdate2005008macosx1039.html

Mac OS X 10.4.2:
http://www.apple.com/support/downloads/securityupdate2005008macosx1042.html

PROVIDED AND/OR DISCOVERED BY:
2) Norbert Rittel, Rittel Consulting
3) MIT Kerberos Team
4) Ilja van Sprundel, Suresec LTD
5) Henrik Dalgaard, Echo One
6) Dino Dai Zovi
9) Luke Fowler, Indiana University Global Research Network Operations
Center

ORIGINAL ADVISORY:
Apple:
http://docs.info.apple.com/article.html?artnum=302413

OTHER REFERENCES:
SA15767:
http://secunia.com/advisories/15767/

SA16449:
http://secunia.com/advisories/16449/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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