cve/2018/CVE-2018-0732.md

CVE-2018-0732

Description

During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).

POC

Reference

• http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
• https://usn.ubuntu.com/3692-1/
• https://www.oracle.com/security-alerts/cpuapr2020.html
• https://www.oracle.com/security-alerts/cpujan2021.html
• https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
• https://www.tenable.com/security/tns-2018-17

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/RClueX/Hackerone-Reports
• https://github.com/chnzzh/OpenSSL-CVE-lib
• https://github.com/holmes-py/reports-summary
• https://github.com/imhunterand/hackerone-publicy-disclosed
• https://github.com/intrigueio/intrigue-ident
• https://github.com/javirodriguezzz/Shodan-Browser
• https://github.com/mrodden/vyger
• https://github.com/tlsresearch/TSI