### [CVE-2015-3193](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3193)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20n%2Fa%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.

### POC

#### Reference
- http://fortiguard.com/advisory/openssl-advisory-december-2015
- http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.securityfocus.com/bid/91787
- http://www.ubuntu.com/usn/USN-2830-1
- https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_mod_exp-CVE-2015-3193.html
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Live-Hack-CVE/CVE-2015-3193
- https://github.com/Live-Hack-CVE/CVE-2017-3732
- https://github.com/Live-Hack-CVE/CVE-2017-3738
- https://github.com/RClueX/Hackerone-Reports
- https://github.com/chnzzh/OpenSSL-CVE-lib
- https://github.com/hannob/bignum-fuzz
- https://github.com/imhunterand/hackerone-publicy-disclosed
- https://github.com/mrash/afl-cve