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

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

Affected Packages

dev-libs/openssl on all architectures
Affected versions < 0.9.7k
Unaffected versions >= 0.9.7k
app-emulation/emul-linux-x86-baselibs on the amd64 architecture
Affected versions < 2.5.2
Unaffected versions >= 2.5.2

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.

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

Release Date
September 07, 2006

Latest Revision
September 08, 2006: 02

Severity
normal

Exploitable
remote

Bugzilla entries