From: Secunia Security Advisories (sec-advsecunia.com)
Date: Sat Nov 22 2003 - 11:07:42 CST

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TITLE:
Opera Browser Skin File Handlig Vulnerabilities

SECUNIA ADVISORY ID:
SA10277

VERIFY ADVISORY:
http://www.secunia.com/advisories/10277/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
Opera 7.x

DESCRIPTION:
Two vulnerabilities have been identified in the Opera browser, which
potentially can be exploited by malicious people to compromise a
user's system.

1) A boundary error in the zip processing when handling skin files
can be exploited to cause a buffer overflow. This may allow execution
of arbitrary code on a user's system, if the user is tricked into
visiting a malicious website.

This issue affects both Linux and Windows systems.

2) An input validation error when handling skin files can be
exploited to place a malicious file in an arbitrary directory on a
user's system. This can be done via a directory traversal attack
where the URL encoded representation of backslashes is used ("%5C").

Example:
http://[malicious_server]/..%5c..%5c..%5c..%5cskin.zip

Successful exploitation requires that the user is tricked into
visiting a malicious website. Only Windows platforms are affected by
this issue.

Both vulnerabilities affect version 7.22 and prior.

SOLUTION:
Update to version 7.23.
http://www.opera.com/download/

REPORTED BY / CREDITS:
Jouko Pynnönen

ORIGINAL ADVISORY:
Changelog for Opera 7.23 for Linux:
http://www.opera.com/linux/changelogs/723/

Changelog for Opera 7.23 for Windows:
http://www.opera.com/windows/changelogs/723/

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