Arch Linux Security Advisory ASA-202003-4 ========================================= Severity: Medium Date : 2020-03-08 CVE-ID : CVE-2020-9283 Package : golang-golang-x-crypto Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-1109 Summary ======= The package golang-golang-x-crypto before version 0.0.20200303-1 is vulnerable to denial of service. Resolution ========== Upgrade to 0.0.20200303-1. # pacman -Syu "golang-golang-x-crypto>=0.0.20200303-1" The problem has been fixed upstream in version 0.0.20200303. Workaround ========== None. Description =========== A security issue has been found in golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975. An attacker can craft an ssh- ed25519 or sk-ssh-ed25519@openssh.com public key, such that the library will panic when trying to verify a signature with it. Clients can deliver such a public key and signature to any golang.org/x/crypto/ssh server with a PublicKeyCallback, and servers can deliver them to any golang.org/x/crypto/ssh client. Impact ====== A remote unauthenticated attacker can serve a malicious SSH public key and crash the service. References ========== https://groups.google.com/forum/#!topic/golang-announce/3L45YRc91SY https://github.com/golang/crypto/commit/bac4c82f69751a6dd76e702d54b3ceb88ada... https://packetstormsecurity.com/files/156480/Go-SSH-0.0.2-Denial-Of-Service.... https://security.archlinux.org/CVE-2020-9283