CVE-2017-3738

Source
Severity Medium
Remote Yes
Type Private key recovery
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.
Group Package Affected Fixed Severity Status Ticket
AVG-551 lib32-openssl 1:1.1.0.g-1 1:1.1.0.h-1 Medium Vulnerable
AVG-540 openssl 1.1.0.g-1 1.1.0.h-1 Medium Vulnerable
AVG-550 openssl-1.0 1.0.2.l-2 1.0.2.n-1 Medium Fixed
AVG-480 lib32-openssl-1.0 1.0.2.l-2 1.0.2.n-1 Medium Fixed
Date Advisory Group Package Severity Description
17 Dec 2017 ASA-201712-11 AVG-480 lib32-openssl-1.0 Medium multiple issues
References
https://www.openssl.org/news/vulnerabilities.html#2017-3738
https://www.openssl.org/news/secadv/20171207.txt
https://github.com/openssl/openssl/commit/5630661aecbea5fe3c4740f5fea744a1f07a6253