CVE-2019-11841 – Go Cryptography Libraries Cleartext Message Spoofing

https://notcve.org/view.php?id=CVE-2019-11841

A message-forgery issue was discovered in crypto/openpgp/clearsign/clearsign.go in supplementary Go cryptography libraries 2019-03-25. According to the OpenPGP Message Format specification in RFC 4880 chapter 7, a cleartext signed message can contain one or more optional "Hash" Armor Headers. The "Hash" Armor Header specifies the message digest algorithm(s) used for the signature. However, the Go clearsign package ignores the value of this header, which allows an attacker to spoof it. Consequently, an attacker can lead a victim to believe the signature was generated using a different message digest algorithm than what was actually used. • http://packetstormsecurity.com/files/152840/Go-Cryptography-Libraries-Cleartext-Message-Spoofing.html https://go.googlesource.com/crypto https://lists.debian.org/debian-lts-announce/2019/09/msg00011.html https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html https://lists.debian.org/debian-lts-announce/2023/06/msg00017.html https://sec-consult.com https://sec-consult.com/en/blog/advisories/cleartext-message-spoofing-in-go-cryptography-libraries-cve-2019-11841 • CWE-347: Improper Verification of Cryptographic Signature •