GLSA 200609-05: OpenSSL, AMD64 x86 emulation base libraries: RSA signature forgery

http://security.gentoo.org/

Severity:	normal
Title:	OpenSSL, AMD64 x86 emulation base libraries: RSA signature forgery
Date:	09/07/2006
Bugs:	#146375, #146438
ID:	200609-05

Synopsis

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

Background

OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport Layer Security protocols and a general-purpose cryptography library. The x86 emulation base libraries for AMD64 contain a vulnerable version of OpenSSL.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/openssl	< 0.9.7k	>= 0.9.7k	All supported architectures
app-emulation/emul-linux-x86-baselibs	< 2.5.2	>= 2.5.2	amd64

Description

Daniel Bleichenbacher discovered that it might be possible to forge signatures signed by RSA keys with the exponent of 3.

Impact

Since several CAs are using an exponent of 3 it might be possible for an attacker to create a key with a false CA signature.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.7k"

All AMD64 x86 emulation base libraries users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-emulation/emul-linux-x86-baselibs-2.5.2"

References

CVE-2006-4339

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200609-05.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.