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CVE-2020-11008

Vulnérabilité moyenne dans git (git)

CVSS 4.0 · Moyenne
EPSS 3.9%
git•git•Versions : >= 2.19.0, 2.19.5, < 2.17.5, >= 2.18.0, < 2.18.4, >= 2.22.0, < 2.22.4, >= 2.24.0, < 2.24.3, >= 2.25.0, < 2.25.4, >= 2.20.0, < 2.20.4, >= 2.23.0, < 2.23.3, >= 2.21.0, < 2.21.3, >= 2.26.0, < 2.26.2

Description

Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. This bug is similar to CVE-2020-5260(GHSA-qm7j-c969-7j4q). The fix for that bug still left the door open for an exploit where _some_ credential is leaked (but the attacker cannot control which one). Git uses external "credential helper" programs to store and retrieve passwords or other credentials from secure storage provided by the operating system. Specially-crafted URLs that are considered illegal as of the recently published Git versions can cause Git to send a "blank" pattern to helpers, missing hostname and protocol fields. Many helpers will interpret this as matching _any_ URL, and will return some unspecified stored password, leaking the password to an attacker's server. The vulnerability can be triggered by feeding a malicious URL to `git clone`. However, the affected URLs look rather suspicious; the likely vector would be through systems which automatically clone URLs not visible to the user, such as Git submodules, or package systems built around Git. The root of the problem is in Git itself, which should not be feeding blank input to helpers. However, the ability to exploit the vulnerability in practice depends on which helpers are in use. Credential helpers which are known to trigger the vulnerability: - Git's "store" helper - Git's "cache" helper - the "osxkeychain" helper that ships in Git's "contrib" directory Credential helpers which are known to be safe even with vulnerable versions of Git: - Git Credential Manager for Windows Any helper not in this list should be assumed to trigger the vulnerability.

Gravité et risque d'exploitation

CVE-2020-11008 obtient un score CVSS de 4.0/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 3.87 %, ce qui la place devant 90.1 % des CVE référencées.

Que faire ?

  • Vérifiez si git (versions >= 2.19.0, 2.19.5, < 2.17.5, >= 2.18.0, < 2.18.4, >= 2.22.0, < 2.22.4, >= 2.24.0, < 2.24.3, >= 2.25.0, < 2.25.4, >= 2.20.0, < 2.20.4, >= 2.23.0, < 2.23.3, >= 2.21.0, < 2.21.3, >= 2.26.0, < 2.26.2) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE