// For flags

CVE-2019-11841

Go Cryptography Libraries Cleartext Message Spoofing

Severity Score

5.9
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

2
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Se descubrió un problema de falsificación de mensaje en Crypto/OpenPGP/ClearSign/ClearSign. en las librerías de criptografía complementario 25-03-2019. De acuerdo con la especificación de formato de mensaje OpenPGP en RFC 4880 capítulo 7, un mensaje con signo de texto no cifrado puede contener uno o más opcional "hash " encabezados de la estructura. Los encabezados de la estructura "hash " especifica los algoritmos de Resumen de mensaje utilizados para la firma. No obstante, el paquete go ClearSign ignora el valor de este encabezado, lo que permite a un atacante sumarlo. Por lo tanto, un atacante puede llevar a una víctima a creer que la firma se generó utilizando un algoritmo de Resumen de mensaje diferente de lo que se usó realmente. Además, dado que la librería omite el análisis del encabezado de la estructura en general, un atacante no solo puede incrustar encabezados de estructura arbitrarios, sino también anteponer texto arbitrario a mensajes sin invalidar las firmas.

During a short security test, SEC Consult found a severe security vulnerability in the clearsign package of supplementary Go cryptography libraries.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-05-09 CVE Reserved
  • 2019-05-13 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-08-04 First Exploit
  • 2024-10-12 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-347: Improper Verification of Cryptographic Signature
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Golang
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 Crypto
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 2019-03-25
Search vendor "Golang" for product "Crypto" and version "2019-03-25"
-
Affected
Debian
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 Debian Linux
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 8.0
Search vendor "Debian" for product "Debian Linux" and version "8.0"
-
Affected
Debian
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 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected