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HistorySep 28, 2006 - 12:00 a.m.

[Full-disclosure] [ GLSA 200609-18 ] Opera: RSA signature forgery

2006-09-2800:00:00
vulners.com
8

Gentoo Linux Security Advisory GLSA 200609-18


                                        http://security.gentoo.org/

Severity: Normal
Title: Opera: RSA signature forgery
Date: September 28, 2006
Bugs: #147838
ID: 200609-18


Synopsis

Opera fails to correctly verify certain signatures.

Background

Opera is a multi-platform web browser.

Affected packages

-------------------------------------------------------------------
 Package           /  Vulnerable  /                     Unaffected
-------------------------------------------------------------------

1 www-client/opera < 9.0.2 >= 9.0.2

Description

Opera makes use of OpenSSL, which fails to correctly verify PKCS #1
v1.5 RSA signatures signed by a key with exponent 3. Some CAs in
Opera's list of trusted signers are using root certificates with
exponent 3.

Impact

An attacker could forge certificates which will appear valid and signed
by a trusted CA.

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 &quot;&gt;=www-client/opera-9.0.2&quot;

References

[ 1 ] Opera Advisory
http://www.opera.com/support/search/supsearch.dml?index=845
[ 2 ] GLSA 200609-05
http://www.gentoo.org/security/en/glsa/glsa-200609-05.xml

Availability

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

http://security.gentoo.org/glsa/glsa-200609-18.xml

Concerns?

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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.

License

Copyright 2006 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.

http://creativecommons.org/licenses/by-sa/2.5