cve/2016/CVE-2016-2178.md

### [CVE-2016-2178](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2178)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The dsa_sign_setup function in crypto/dsa/dsa_ossl.c in OpenSSL through 1.0.2h does not properly ensure the use of constant-time operations, which makes it easier for local users to discover a DSA private key via a timing side-channel attack.

### POC

#### Reference
- http://eprint.iacr.org/2016/594.pdf
- http://seclists.org/fulldisclosure/2017/Jul/31
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312
- https://www.tenable.com/security/tns-2016-20

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/chnzzh/OpenSSL-CVE-lib
- https://github.com/nidhi7598/OPENSSL_1.0.1g_CVE-2016-2178
- https://github.com/tomwillfixit/alpine-cvecheck