GLSA 200311-02: Opera: buffer overflows in 7.11 and 7.20

Title:Opera: buffer overflows in 7.11 and 7.20
Bugs: #31775


Buffer overflows exist in Opera 7.11 and 7.20 that can cause Opera to crash, and can potentially overwrite arbitrary bytes on the heap leading to a system compromise.


Opera is a multi-platform web browser.

Affected packages

Package Vulnerable Unaffected Architecture(s)
www-client/opera == 7.20 >= 7.21 All supported architectures


The Opera browser can cause a buffer allocated on the heap to overflow under certain HREFs when rendering HTML. The mail system is also deemed vulnerable and an attacker can send an email containing a malformed HREF, or plant the malicious HREF on a web site.


Certain HREFs can cause a buffer allocated on the heap to overflow when rendering HTML which can allow arbitrary bytes on the heap to be overwritten which can result in a system compromise.


There is no known workaround at this time.


Users are encouraged to perform an 'emerge sync' and upgrade the package to the latest available version. Opera 7.22 is recommended as Opera 7.21 is vulnerable to other security flaws. Specific steps to upgrade:

    # emerge sync
    # emerge -pv '>=www-client/opera-7.22'
    # emerge '>=www-client/opera-7.22'
    # emerge clean



This GLSA and any updates to it are available for viewing at the Gentoo Security Website:


Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to or alternatively, you may file a bug at


Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

Thank you!