71845 : OpenSSL FIPS Mode Diffie-Hellman Key Exchange Predictable Secret MiTM Weakness
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Timeline

Disclosure Date
2011-04-14

Description

OpenSSL contains a flaw related to the use of weak keys in a Diffie-Hellman (DH) key exchange. An OpenSSL server does not exclude weak DH keys sent by a client. This issue, in conjunction with other weaknesses, could lead to a Man-in-The-Middle (MiTM) attack and cause the program to generate a predictable secret.

Classification

Location: Remote / Network Access
Attack Type: Cryptographic
Impact: Loss of Integrity
Solution: Workaround, Upgrade
Exploit: Exploit Unknown
Disclosure: Third-party Disputed
OSVDB: Concern

Solution

Upgrade to version 1.0.0 or higher, as it has been reported to fix this vulnerability. It is also possible to temporarily work around the flaw by implementing the following workarounds: disable FIPS mode or configure the
ciphersuite used by the server to not include any Diffie-Hellman key
exchanges.

Products

The OpenSSL Project

OpenSSL

Unspecified

References

CVE ID: 2011-5095 (see also: NVD)
Related OSVDB ID: 70945
Mail List Post: http://attrition.org/pipermail/vim/2011-April/002511.html
Other Advisory URL: http://www.cl.cam.ac.uk/~rja14/Papers/psandqs.pdf
https://discussions.nessus.org/thread/3381

Tools & Filters

	53360

Credit

Larry Highsmith - Subreption LLC

CVSSv2 Score

CVSSv2 Base Score = 4.0
Source: nvd.nist.gov | Generated: 2012-06-21 | Disagree?

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