CVE-2016-0736 Weak cryptography in Apache HTTP Server
Apache HTTP Server's mod_session_crypto used unauthenticated encryption modes, allowing attackers to decrypt session data via padding oracle attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-0736?
CVE-2016-0736 is a high-severity vulnerability in Apache Http Server, published on 27 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.
Weakness: CWE-310
Which versions are affected by CVE-2016-0736?
It affects 1 product.
Products include Apache Http Server.
How do I fix CVE-2016-0736?
Upgrade to a fixed version.
Is CVE-2016-0736 being exploited?
There is no known exploitation of CVE-2016-0736 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in Apache Http Server
Sources
Also known as DEBIAN-CVE-2016-0736, GHSA-mxm5-vg5c-rx7v, UBUNTU-CVE-2016-0736.