CVE-2011-4354

Description

crypto/bn/bn_nist.c in OpenSSL before 0.9.8h on 32-bit platforms, as used in stunnel and other products, in certain circumstances involving ECDH or ECDHE cipher suites, uses an incorrect modular reduction algorithm in its implementation of the P-256 and P-384 NIST elliptic curves, which allows remote attackers to obtain the private key of a TLS server via multiple handshake attempts.

References

Link	Tags
http://crypto.di.uminho.pt/CACE/CT-RSA2012-openssl-src.zip
https://bugzilla.redhat.com/show_bug.cgi?id=757909
http://openwall.com/lists/oss-security/2011/12/01/6	mailing list
http://eprint.iacr.org/2011/633
http://rt.openssl.org/Ticket/Display.html?id=1593&user=guest&pass=guest
http://cvs.openssl.org/filediff?f=openssl/crypto/bn/bn_nist.c&v1=1.14&v2=1.21
http://www.debian.org/security/2012/dsa-2390	vendor advisory
http://marc.info/?t=119271238800004

Frequently Asked Questions

What is the severity of CVE-2011-4354?: CVE-2011-4354 has been scored as a medium severity vulnerability.
How to fix CVE-2011-4354?: To fix CVE-2011-4354, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-4354 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2011-4354 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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Description

Category

CWE-310 – Cryptographic Issues

References

Frequently Asked Questions