CVE-2015-0205 Auth bypass in n/a

What is CVE-2015-0205?

CVE-2015-0205 is a medium-severity authentication bypass vulnerability in Openssl Openssl, published on 9 Jan 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The ssl3_get_cert_verify function in s3_srvr.c in OpenSSL 1.0.0 before 1.0.0p and 1.0.1 before 1.0.1k accepts client authentication with a Diffie-Hellman (DH) certificate without requiring a CertificateVerify message, which allows remote attackers to obtain access without knowledge of a private key via crafted TLS Handshake Protocol traffic to a server that recognizes a Certification Authority with DH support.

Weakness: CWE-310

Which versions are affected by CVE-2015-0205?

It affects 1 product.

Products include Openssl Openssl.

How do I fix CVE-2015-0205?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2015-0205 being exploited?

There is no known exploitation of CVE-2015-0205 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Openssl Openssl

• CVE-2009-3245 Null dereference in n/a Critical 10.0
• CVE-2006-3738 Memory corruption in n/a Critical 10.0
• CVE-2026-63073 Untrusted Sender DN Used as Format String in CMP Response Validation Critical 9.8
• CVE-2016-6309 Use after free in n/a Critical 9.8
• CVE-2016-0799 Integer overflow in n/a Critical 9.8

All Openssl Openssl vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2015-0205, GHSA-j635-3m2r-m6v7, UBUNTU-CVE-2015-0205.