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Bug 1450407 - (CVE-2017-8386) CVE-2017-8386 git: Escape out of git-shell
CVE-2017-8386 git: Escape out of git-shell
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170505,repor...
: Reopened, Security
Depends On: 1450409 1450410 1450799 1451691 1480504 1480505
Blocks: 1415638 1450411
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Reported: 2017-05-12 08:43 EDT by Andrej Nemec
Modified: 2018-03-29 18:03 EDT (History)
15 users (show)

See Also:
Fixed In Version: git 2.4.12, git 2.5.6, git 2.6.7, git 2.7.5, git 2.8.5, git 2.9.4, git 2.10.3, git 2.11.2, git 2.12.3
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way git-shell handled command-line options for the restricted set of git-shell commands. A remote, authenticated attacker could use this flaw to bypass git-shell restrictions, to view and manipulate files, by abusing the instance of the less command launched using crafted command-line options.
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Clone Of:
Environment:
Last Closed: 2017-08-02 03:27:46 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2004 normal SHIPPED_LIVE Moderate: git security and bug fix update 2017-08-01 14:33:36 EDT
Red Hat Product Errata RHSA-2017:2491 normal SHIPPED_LIVE Important: rh-git29-git security update 2017-08-17 21:56:10 EDT

  None (edit)
Description Andrej Nemec 2017-05-12 08:43:44 EDT 
A vulnerability was found in git concerning the git shell. A user who comes over SSH could run an interactive pager by causing it to spawn "git upload-pack --help".

"git-shell" is a restricted login shell that can be used on a server to prevent SSH clients from running any programs except those needed for git fetches and pushes. If you are not running a server, or if your server has not been explicitly configured to use git-shell as a login shell, you are not affected.

Upstream patch:

https://kernel.googlesource.com/pub/scm/git/git/+/3ec804490a265f4c418a321428c12f3f18b7eff5

References:

https://insinuator.net/2017/05/git-shell-bypass-by-abusing-less-cve-2017-8386/
http://public-inbox.org/git/xmqq8tm5ziat.fsf@gitster.mtv.corp.google.com/
Comment 1 Andrej Nemec 2017-05-12 08:44:36 EDT 
Created git tracking bugs for this issue:

Affects: fedora-all [bug 1450409]
Affects: openshift-1 [bug 1450410]
Comment 5 errata-xmlrpc 2017-08-01 16:52:52 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2004 https://access.redhat.com/errata/RHSA-2017:2004
Comment 7 errata-xmlrpc 2017-08-17 17:56:48 EDT 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 7

Via RHSA-2017:2491 https://access.redhat.com/errata/RHSA-2017:2491
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