cve/2018/CVE-2018-0734.md

### [CVE-2018-0734](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-0734)
![](https://img.shields.io/static/v1?label=Product&message=OpenSSL&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Constant%20time%20issue&color=brighgreen)

### Description

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.tenable.com/security/tns-2018-16
- https://www.tenable.com/security/tns-2018-17

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Qi-Zhan/ps3
- https://github.com/chnzzh/OpenSSL-CVE-lib
- https://github.com/javirodriguezzz/Shodan-Browser
- https://github.com/mrodden/vyger
- https://github.com/tlsresearch/TSI