Arch Linux Security Advisory ASA-201804-6 ========================================= Severity: Medium Date : 2018-04-15 CVE-ID : CVE-2017-3738 Package : lib32-openssl Type : private key recovery Remote : Yes Link : https://security.archlinux.org/AVG-551 Summary ======= The package lib32-openssl before version 1:1.1.0.h-1 is vulnerable to private key recovery. Resolution ========== Upgrade to 1:1.1.0.h-1. # pacman -Syu "lib32-openssl>=1:1.1.0.h-1" The problem has been fixed upstream in version 1.1.0.h. Workaround ========== None. Description =========== There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. Impact ====== A remote attacker might be able to recover a private key (in very unlikely cases). References ========== https://www.openssl.org/news/vulnerabilities.html#2017-3738 https://www.openssl.org/news/secadv/20171207.txt https://github.com/openssl/openssl/commit/5630661aecbea5fe3c4740f5fea744a1f0... https://security.archlinux.org/CVE-2017-3738