CVE-2019-11841 in GoLang and Debian Products
Published on May 22, 2019
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.
Products Associated with CVE-2019-11841
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Vulnerable Packages
The following package name and versions may be associated with CVE-2019-11841
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| npm | openpgp | < 4.10.11 | 4.10.11 |
| npm | openpgp | >= 5.0.0, < 5.10.1 | 5.10.1 |
Exploit Probability
EPSS
0.40%
Percentile
60.16%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.