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Gentoo: 202310-12 Critical: OpenSSL Cipher Exploit Vulnerability

gentoo
Calendar Grey July 10, 2015
Dist Gentoo Esm H88
Gentoo GLSA 202308-20 outlines a Medium severity vulnerability in OpenSSH that permits unauthorized access to restricted user sessions.
Certain checks on untrusted certificates can be bypassed.

Summary

During certificate verification, OpenSSL attempts to find an alternative certificate chain if the first attempt to build such a chain fails.

Topics%20covered

Topics Covered

security advisory gentoo openssl normal severity certificate forgery

Resolution

All OpenSSL users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.1p"

References

[ 1 ] CVE-2015-1793 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1793

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201507-15
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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.

Severity: Normal
Title: OpenSSL: Alternate chains certificate forgery
Date: July 10, 2015
Bugs: #554172
ID: 201507-15

Topics%20covered

Topics Covered

security advisory gentoo openssl normal severity certificate forgery

Synopsis

Certain checks on untrusted certificates can be bypassed.

Background

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general purpose cryptography library.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-libs/openssl < 1.0.1p >= 1.0.1p

Impact

===== A remote attacker could cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and "issue" an invalid certificate.

Workaround

There is no known workaround at this time.

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