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CVE-2020-5260

Status Candidate

Overview

Affected versions of Git have a vulnerability whereby Git can be tricked into sending private credentials to a host controlled by an attacker. 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 contain an encoded newline can inject unintended values into the credential helper protocol stream, causing the credential helper to retrieve the password for one server (e.g., good.example.com) for an HTTP request being made to another server (e.g., evil.example.com), resulting in credentials for the former being sent to the latter. There are no restrictions on the relationship between the two, meaning that an attacker can craft a URL that will present stored credentials for any host to a host of their choosing. 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 problem has been patched in the versions published on April 14th, 2020, going back to v2.17.x. Anyone wishing to backport the change further can do so by applying commit 9a6bbee (the full release includes extra checks for git fsck, but that commit is sufficient to protect clients against the vulnerability). The patched versions are: 2.17.4, 2.18.3, 2.19.4, 2.20.3, 2.21.2, 2.22.3, 2.23.2, 2.24.2, 2.25.3, 2.26.1.

Related Files

Red Hat Security Advisory 2020-3581-01
Posted Aug 31, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-3581-01 - Git is a distributed revision control system with a decentralized architecture. As opposed to centralized version control systems with a client-server model, Git ensures that each working copy of a Git repository is an exact copy with complete revision history. This not only allows the user to work on and contribute to projects without the need to have permission to push the changes to their official repositories, but also makes it possible for the user to work with no network connection. Issues addressed include a password leak vulnerability.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-11008, CVE-2020-5260
SHA-256 | ad853c6d567b09664b902360df96adf9938e41523967c5d88fb4937412a5c0ba
Debian Security Advisory 4657-1
Posted Apr 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4657-1 - Felix Wilhelm of Google Project Zero discovered a flaw in git, a fast, scalable, distributed revision control system. With a crafted URL that contains a newline, the credential helper machinery can be fooled to return credential information for a wrong host.

tags | advisory
systems | linux, debian
advisories | CVE-2020-5260
SHA-256 | ce8ec173f3d76b1ac080eefe167ec67f57b23d1913659b9bb470439c7a7194d0
Gentoo Linux Security Advisory 202004-13
Posted Apr 23, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202004-13 - Multiple vulnerabilities have been found in Git which might all allow attackers to access sensitive information. Versions less than 2.26.2 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2020-11008, CVE-2020-5260
SHA-256 | 862a28af41503547a97dcc01c1875ab49c70676db9948955cb81cca3132e5fb9
Red Hat Security Advisory 2020-1513-01
Posted Apr 21, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1513-01 - Git is a distributed revision control system with a decentralized architecture. A credential leak vulnerability has been addressed.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-5260
SHA-256 | c4caf637667ce99c4f0bd3337c845778695775264de1fe4ea35bc47925161cf4
Red Hat Security Advisory 2020-1518-01
Posted Apr 21, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1518-01 - Git is a distributed revision control system with a decentralized architecture. A credential leak vulnerability has been addressed.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-5260
SHA-256 | b1e3d6080cfa1645a6b7c274fe2026fefe3426f7b2a1a3724f1fcf04cfd1d6a1
Red Hat Security Advisory 2020-1511-01
Posted Apr 21, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1511-01 - Git is a distributed revision control system with a decentralized architecture. A credential leak vulnerability was addressed.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-5260
SHA-256 | 005df15df994c6f92a7dc8519ab369eac289252bdb58e17fee747d70b01755cd
Red Hat Security Advisory 2020-1503-01
Posted Apr 21, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-1503-01 - Git is a distributed revision control system with a decentralized architecture. A credential leak issue has been addressed.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-5260
SHA-256 | 039638d0031ac321f2d4bfae22da8a54c33ec834eddcdecfc074b7ef007149d7
Git Credential Helper Protocol Newline Injection
Posted Apr 15, 2020
Authored by Google Security Research, Felix Wilhelm

A git clone action can leak cached / stored credentials for github.com to example.com due to insecure handling of newlines in the credential helper protocol.

tags | exploit, protocol
advisories | CVE-2020-5260
SHA-256 | 6ed18788c9d0b689b962cf0717c7f1295a605925baa43166ab82599970c79913
Ubuntu Security Notice USN-4329-1
Posted Apr 15, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4329-1 - Felix Wilhelm discovered that Git incorrectly handled certain URLs that included newlines. A remote attacker could possibly use this issue to trick Git into returning credential information for a wrong host.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2020-5260
SHA-256 | c507f897a077e45f8e138f77a383e2e59f2ee92189aa4eff179d2ffee8fb105c
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