CVE-2019-11841 Detail
Current Description
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.
Source:
MITRE
View Analysis Description
Analysis Description
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.
Source:
MITRE
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
5.9 MEDIUM
Vector:
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
(V3 legend)
Impact Score:
3.6
Exploitability Score:
2.2
Attack Vector (AV):
Network
Attack Complexity (AC):
High
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
High
Availability (A):
None
CVSS v2.0 Severity and Metrics:
Base Score:
4.3 MEDIUM
Vector:
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
(V2 legend)
Impact Subscore:
2.9
Exploitability Subscore:
8.6
Access Vector (AV):
Network
Access Complexity (AC):
Medium
Authentication (AU):
None
Confidentiality (C):
None
Integrity (I):
Partial
Availability (A):
None
Additional Information:
Allows unauthorized modification
References to Advisories, Solutions, and Tools
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Change History
1 change record found
- show changes
Initial Analysis -
5/24/2019 7:29:37 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:a:golang:crypto:2019-03-25:*:*:*:*:*:*:* |
| Added |
CVSS V2 |
|
(AV:N/AC:M/Au:N/C:N/I:P/A:N) |
| Added |
CVSS V3 |
|
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| Added |
CWE |
|
CWE-310 |
| Changed |
Reference Type |
http://packetstormsecurity.com/files/152840/Go-Cryptography-Libraries-Cleartext-Message-Spoofing.html No Types Assigned |
http://packetstormsecurity.com/files/152840/Go-Cryptography-Libraries-Cleartext-Message-Spoofing.html Exploit, Third Party Advisory, VDB Entry |
| Changed |
Reference Type |
https://go.googlesource.com/crypto/ No Types Assigned |
https://go.googlesource.com/crypto/ Product, Third Party Advisory |
| Changed |
Reference Type |
https://sec-consult.com/ No Types Assigned |
https://sec-consult.com/ Third Party Advisory |
| Changed |
Reference Type |
https://sec-consult.com/en/blog/advisories/cleartext-message-spoofing-in-go-cryptography-libraries-cve-2019-11841/ No Types Assigned |
https://sec-consult.com/en/blog/advisories/cleartext-message-spoofing-in-go-cryptography-libraries-cve-2019-11841/ Exploit, Third Party Advisory |
Quick Info
CVE Dictionary Entry:
CVE-2019-11841
NVD Published Date:
05/22/2019
NVD Last Modified:
05/24/2019
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