Opera: Buffer overflow — GLSA 200606-01

Opera contains an integer signedness error resulting in a buffer overflow which may allow a remote attacker to execute arbitrary code.

Affected Packages

www-client/opera on all architectures
Affected versions < 8.54
Unaffected versions >= 8.54

Background

Opera is a multi-platform web browser.

Description

SEC Consult has discovered a buffer overflow in the code processing style sheet attributes. It is caused by an integer signedness error in a length check followed by a call to a string function. It seems to be hard to exploit this buffer overflow to execute arbitrary code because of the very large amount memory that has to be copied.

Impact

A remote attacker can entice a user to visit a web page containing a specially crafted style sheet attribute that will crash the user's browser and maybe lead to the execution of arbitrary code.

Workaround

There is no known workaround at this time.

Resolution

All Opera users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=www-client/opera-8.54"

References

Release Date
June 07, 2006

Latest Revision
June 07, 2006: 01

Severity
normal

Exploitable
remote

Bugzilla entries