Opera: Buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200606-01 / opera
Release Date	June 07, 2006
Latest Revision	June 07, 2006: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-client/opera	< 8.54	>= 8.54	All supported architectures

Related bugreports: #129800

Synopsis

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

2. Impact Information

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Opera users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4. References

CVE-2006-1834

Updated June 07, 2006

Summary: This is a Gentoo Linux Security Advisory

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