GLSA 200610-06: Mozilla Network Security Service (NSS): RSA signature forgery

http://security.gentoo.org/

Severity:	normal
Title:	Mozilla Network Security Service (NSS): RSA signature forgery
Date:	10/17/2006
Bugs:	#148283
ID:	200610-06

Synopsis

NSS fails to properly validate PKCS #1 v1.5 signatures.

Background

The Mozilla Network Security Service is a library implementing security features like SSL v.2/v.3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS #12, S/MIME and X.509 certificates.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/nss	< 3.11.3	>= 3.11.3	All supported architectures

Description

Daniel Bleichenbacher discovered that it might be possible to forge signatures signed by RSA keys with the exponent of 3. This affects a number of RSA signature implementations, including Mozilla's NSS.

Impact

Since several Certificate Authorities (CAs) are using an exponent of 3 it might be possible for an attacker to create a key with a false CA signature. This impacts any software using the NSS library, like the Mozilla products Firefox, Thunderbird and Seamonkey.

Workaround

There is no known workaround at this time.

Resolution

All NSS users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/nss-3.11.3"

Note: As usual after updating a library, you should run 'revdep-rebuild' (from the app-portage/gentoolkit package) to ensure that all applications linked to it are properly rebuilt.

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200610-06.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 security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.