CVE-2019-11841 (Medium) detected in cryptof70185d77e8278766928032ee1355e3da47e7181

[mend-bolt-for-github]

CVE-2019-11841 - Medium Severity Vulnerability

Vulnerable Library - cryptof70185d77e8278766928032ee1355e3da47e7181

[mirror] Go supplementary cryptography libraries

Library home page: https://github.com/golang/crypto.git

Found in HEAD commit: 9060713df80212ee5546b36d1083fb607520eb0b

Found in base branch: master

Vulnerable Source Files (1)

/vendor/golang.org/x/crypto/openpgp/clearsign/clearsign.go

Vulnerability Details

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.

Publish Date: 2019-05-22

URL: CVE-2019-11841

CVSS 3 Score Details (5.9)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: High
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://nvd.nist.gov/vuln/detail/CVE-2019-11841

Release Date: 2019-05-22

Fix Resolution: golang-golang-x-crypto-dev - 1:0.0~git20200221.2aa609c-1,1:0.0~git20170407.0.55a552f+REALLY.0.0~git20161012.0.5f31782-1+deb8u1,1:0.0~git20200221.2aa609c-1;golang-go.crypto-dev - 1:0.0~git20170407.0.55a552f+REALLY.0.0~git20161012.0.5f31782-1+deb8u1,1:0.0~git20200221.2aa609c-1,1:0.0~git20200221.2aa609c-1

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