// For flags

CVE-2022-30636

Limited directory traversal vulnerability on Windows in golang.org/x/crypto

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

httpTokenCacheKey uses path.Base to extract the expected HTTP-01 token value to lookup in the DirCache implementation. On Windows, path.Base acts differently to filepath.Base, since Windows uses a different path separator (\ vs. /), allowing a user to provide a relative path, i.e. .well-known/acme-challenge/..\..\asd becomes ..\..\asd. The extracted path is then suffixed with +http-01, joined with the cache directory, and opened. Since the controlled path is suffixed with +http-01 before opening, the impact of this is significantly limited, since it only allows reading arbitrary files on the system if and only if they have this suffix.

httpTokenCacheKey usa path.Base para extraer el valor del token HTTP-01 esperado para buscarlo en la implementación de DirCache. En Windows, path.Base actúa de manera diferente a filepath.Base, ya que Windows usa un separador de ruta diferente (\ vs. /), lo que permite al usuario proporcionar una ruta relativa, es decir, .well-known/acme-challenge/..\. .\asd se convierte en ..\..\asd. Luego, la ruta extraída tiene el sufijo +http-01, se une al directorio de caché y se abre. Dado que la ruta controlada tiene el sufijo +http-01 antes de abrirse, el impacto de esto es significativamente limitado, ya que solo permite leer archivos arbitrarios en el sistema si y solo si tienen este sufijo.

*Credits: Juho Nurminen of Mattermost
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
Poc
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2022-05-12 CVE Reserved
  • 2024-07-02 CVE Published
  • 2024-07-03 EPSS Updated
  • 2024-08-07 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Golang.org/x/crypto
Search vendor "Golang.org/x/crypto"
 Golang.org/x/crypto/acme/autocert
Search vendor "Golang.org/x/crypto" for product "Golang.org/x/crypto/acme/autocert"
 < 0.0.0-20220525230936-793ad666bf5e
Search vendor "Golang.org/x/crypto" for product "Golang.org/x/crypto/acme/autocert" and version " < 0.0.0-20220525230936-793ad666bf5e"
en
Affected