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Security Advisories: GSA_kwCzR0hTQS14M2pyLXBmNmctYzQ4Zs4AAgxZ

Golang/x/crypto message forgery vulnerability

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. Moreover, since the library skips Armor Header parsing in general, an attacker can not only embed arbitrary Armor Headers, but also prepend arbitrary text to cleartext messages without invalidating the signatures.

Permalink: https://github.com/advisories/GHSA-x3jr-pf6g-c48f
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS14M2pyLXBmNmctYzQ4Zs4AAgxZ
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 2 years ago
Updated: 7 months ago

CVSS Score: 5.9
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Identifiers: GHSA-x3jr-pf6g-c48f, CVE-2019-11841
References:

• https://nvd.nist.gov/vuln/detail/CVE-2019-11841
• https://lists.debian.org/debian-lts-announce/2019/09/msg00011.html
• https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html
• http://packetstormsecurity.com/files/152840/Go-Cryptography-Libraries-Cleartext-Message-Spoofing.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00017.html
• https://github.com/golang/crypto/commit/c05e17bb3b2dca130fc919668a96b4bec9eb9442
• https://groups.google.com/d/msg/golang-openpgp/6vdgZoTgbIY/K6bBY9z3DAAJ
• https://web.archive.org/web/20201207161832/https://sec-consult.com/en/blog/advisories/cleartext-message-spoofing-in-go-cryptography-libraries-cve-2019-11841/
• https://go-review.git.corp.google.com/c/crypto/+/173778
• https://go.googlesource.com/crypto/+/c05e17bb3b2dca130fc919668a96b4bec9eb9442
• https://pkg.go.dev/vuln/GO-2023-1992
• https://github.com/advisories/GHSA-x3jr-pf6g-c48f

Repository: https://github.com/golang/crypto
Blast Radius: 32.0

Affected Packages