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                             CERT-Renater

                 Note d'Information No. 2020/VULN221
_____________________________________________________________________

DATE                : 23/04/2020

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Git versions prior to 2.26.2,
                                         2.17.4.

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https://www.openwall.com/lists/oss-security/2020/04/20/1
https://lore.kernel.org/git/xmqqy2qy7xn8.fsf@gitster.c.googlers.com/
_____________________________________________________________________

Team,

Today, the Git project released v2.26.2 (and corresponding point
releases as far back as the v2.17.x track) to address the following
issue:

  * CVE-2020-11008:
    With a crafted URL that contains a newline or empty host, or lacks a
    scheme, the credential helper machinery can be fooled into providing
    credential information that is not appropriate for the protocol in
    use and host being contacted.

    Unlike the vulnerability CVE-2020-5260 fixed in v2.17.4, the
    credentials are not for a host of the attacker's choosing; instead,
    they are for some unspecified host (based on how the configured
    credential helper handles an absent "host" parameter).

    The attack has been made impossible by refusing to work with
    under-specified credential patterns.

The distros list has been notified of this release in advance of its
disclosure. This notification serves the same purpose for the
oss-security list, too.

Full details are available at the following link:

  https://github.com/git/git/security/advisories/GHSA-hjc9-x69f-jqj7

Per the list guidelines, I am attaching a plaintext representation of
the above so as to include all essential materials within the mail
itself.


Thanks,
Taylor
_____________________________________________________________________

Date: Tue, 14 Apr 2020 11:03:23 -0700
Message-ID: <xmqqy2qy7xn8.fsf@gitster.c.googlers.com> (raw)

Today, the Git project is releasing the following Git versions:

    v2.26.1, v2.25.3, v2.24.2, v2.23.2, v2.22.3, v2.21.2, v2.20.3,
    v2.19.4, v2.18.3, and v2.17.4

These releases address the security issue CVE-2020-5260, which
allowed a crafted URL to trick a Git client to send credential
information for a wrong host to the attacker's site.  Credit for
finding the vulnerability goes to Felix Wilhelm of Google Project
Zero, and credit for fixing it goes to Jeff King of GitHub.

Users of the affected maintenance tracks are urged to upgrade.

The tarballs are found at:

    https://www.kernel.org/pub/software/scm/git/

The following public repositories all have a copy of the 'v2.26.1'
and other tags:

  url = https://kernel.googlesource.com/pub/scm/git/git
  url = git://repo.or.cz/alt-git.git
  url = https://github.com/gitster/git

Attached below is the release notes for 2.17.4; all the newer
maintenance tracks listed at the beginning of this message are
updated with the same fix, so I won't repeat them here.

Thanks.

--------------------------------------------------
Git v2.17.4 Release Notes
=========================

This release is to address the security issue: CVE-2020-5260

Fixes since v2.17.3
-------------------

 * With a crafted URL that contains a newline in it, the credential
   helper machinery can be fooled to give credential information for
   a wrong host.  The attack has been made impossible by forbidding
   a newline character in any value passed via the credential
   protocol.

Credit for finding the vulnerability goes to Felix Wilhelm of Google
Project Zero.

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