git-shell in git before 2.4.12, 2.5.x before 2.5.6, 2.6.x before 2.6.7, 2.7.x before 2.7.5, 2.8.x before 2.8.5, 2.9.x before 2.9.4, 2.10.x before 2.10.3, 2.11.x before 2.11.2, and 2.12.x before 2.12.3 might allow remote authenticated users to gain privileges via a repository name that starts with a - (dash) character.

According to the versions of the git package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - 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.(CVE-2017-8386)

  - In Git before 2.13.7, 2.14.x before 2.14.4, 2.15.x     before 2.15.2, 2.16.x before 2.16.4, and 2.17.x before     2.17.1, remote code execution can occur. With a crafted     .gitmodules file, a malicious project can execute an     arbitrary script on a machine that runs 'git clone
    --recurse-submodules' because submodule 'names' are     obtained from this file, and then appended to     $GIT_DIR/modules, leading to directory traversal with     '../' in a name. Finally, post-checkout hooks from a     submodule are executed, bypassing the intended design     in which hooks are not obtained from a remote     server.(CVE-2018-11235)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the git package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - It was found that the git-prompt.sh script shipped with     git failed to correctly handle branch names containing     special characters. A specially crafted git repository     could use this flaw to execute arbitrary commands if a     user working with the repository configured their shell     to include repository information in the prompt.
    (CVE-2014-9938)

  - 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. (CVE-2017-8386)

  - A shell command injection flaw related to the handling     of ''ssh'' URLs has been discovered in Git. An attacker     could use this flaw to execute shell commands with the     privileges of the user running the Git client, for     example, when performing a ''clone'' action on a     malicious repository or a legitimate repository     containing a malicious commit. (CVE-2017-1000117)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for git is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

Security Fix(es) :

* It was found that the git-prompt.sh script shipped with git failed to correctly handle branch names containing special characters. A specially crafted git repository could use this flaw to execute arbitrary commands if a user working with the repository configured their shell to include repository information in the prompt.
(CVE-2014-9938)

* 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. (CVE-2017-8386)

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

Security Fix(es) :

  - It was found that the git-prompt.sh script shipped with     git failed to correctly handle branch names containing     special characters. A specially crafted git repository     could use this flaw to execute arbitrary commands if a     user working with the repository configured their shell     to include repository information in the prompt.
    (CVE-2014-9938)

  - 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.
    (CVE-2017-8386)

From Red Hat Security Advisory 2017:2004 :

An update for git is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

Security Fix(es) :

* It was found that the git-prompt.sh script shipped with git failed to correctly handle branch names containing special characters. A specially crafted git repository could use this flaw to execute arbitrary commands if a user working with the repository configured their shell to include repository information in the prompt.
(CVE-2014-9938)

* 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. (CVE-2017-8386)

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

An issue in `git-shell` could allow remote users to run an interactive pager. From the [update announcement](https://public-inbox.org/git/xmqq8tm5ziat.fsf@gitster.mt v.corp.google.com/) :

... fix a recently disclosed problem with 'git shell', which may allow a user who comes over SSH to run an interactive pager by causing it to spawn 'git upload-pack --help' (CVE-2017-8386).

The announcement also notes :

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. Also note that sites running 'git shell' behind gitolite are NOT vulnerable. 

Further details can be found in the commit message which fixed the issue ([3ec804490](https://github.com/git/git/commit/3ec804490)).

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201706-04 (Git: Security bypass)

    Timo Schmid discovered that the Git restricted shell incorrectly       filtered allowed commands.
  Impact :

    A remote attacker could possibly bypass security restrictions and access       sensitive information.
  Workaround :

    There is no known workaround at this time.

Escape out of git-shell

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. (CVE-2017-8386)

This update for git fixes the following issues :

  - git 2.12.3 :

  - CVE-2017-8386: Fix git-shell not to escape with the     starting dash name (bsc#1038395)

  - Fix for potential segv introduced in v2.11.0 and later

  - Misc fixes and cleanups.

  - git 2.12.2 :

  - CLI output fixes

  - 'Dump http' transport fixes

  - various fixes for internal code paths 

  - Trailer 'Cc:' RFC fix

  - git 2.12.1 :

  - Reduce authentication round-trip over HTTP when the     server supports just a single authentication method.

  - 'git add -i' patch subcommand fixed to have a path     selection

  - various path verification fixes

  - fix 'git log -L...' buffer overrun

This update was imported from the SUSE:SLE-12:Update update project.

This update for git fixes the following issues :

  - git 2.12.3 :

  - CVE-2017-8386: Fix git-shell not to escape with the     starting dash name (bsc#1038395)

  - Fix for potential segv introduced in v2.11.0 and later

  - Misc fixes and cleanups.

  - git 2.12.2 :

  - CLI output fixes

  - 'Dump http' transport fixes

  - various fixes for internal code paths

  - Trailer 'Cc:' RFC fix

  - git 2.12.1 :

  - Reduce authentication round-trip over HTTP when the     server supports just a single authentication method.

  - 'git add -i' patch subcommand fixed to have a path     selection

  - various path verification fixes

  - fix 'git log -L...' buffer overrun

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Timo Schmid discovered that the Git restricted shell incorrectly filtered allowed commands. A remote attacker could possibly use this issue to run an interactive pager and access sensitive information.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Timo Schmid of ERNW GmbH discovered that the Git git-shell, a restricted login shell for Git-only SSH access, allows a user to run an interactive pager by causing it to spawn 'git upload-pack --help'.

Timo Schmid of ERNW GmbH discovered that the Git git-shell, a restricted login shell for Git-only SSH access, allows a user to run an interactive pager by causing it to spawn 'git upload-pack --help'.

For Debian 7 'Wheezy', these problems have been fixed in version 1:1.7.10.4-1+wheezy4.

We recommend that you upgrade your git packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
135580	SUSE SLES12 Security Update : git (SUSE-SU-2020:0992-1)	Nessus	SuSE Local Security Checks	critical
119068	EulerOS Virtualization 2.5.1 : git (EulerOS-SA-2018-1377)	Nessus	Huawei Local Security Checks	high
103026	EulerOS 2.0 SP2 : git (EulerOS-SA-2017-1188)	Nessus	Huawei Local Security Checks	high
103025	EulerOS 2.0 SP1 : git (EulerOS-SA-2017-1187)	Nessus	Huawei Local Security Checks	high
102749	CentOS 7 : git (CESA-2017:2004)	Nessus	CentOS Local Security Checks	high
102640	Scientific Linux Security Update : git on SL7.x x86_64 (20170801)	Nessus	Scientific Linux Local Security Checks	high
102294	Oracle Linux 7 : git (ELSA-2017-2004)	Nessus	Oracle Linux Local Security Checks	high
102110	RHEL 7 : git (RHSA-2017:2004)	Nessus	Red Hat Local Security Checks	high
101665	Fedora 26 : git (2017-7ea0e02914)	Nessus	Fedora Local Security Checks	high
100647	GLSA-201706-04 : Git: Security bypass	Nessus	Gentoo Local Security Checks	high
100643	Amazon Linux AMI : git (ALAS-2017-842)	Nessus	Amazon Linux Local Security Checks	high
100500	openSUSE Security Update : git (openSUSE-2017-624)	Nessus	SuSE Local Security Checks	high
100485	Fedora 24 : git (2017-01a7989fc0)	Nessus	Fedora Local Security Checks	high
100319	SUSE SLES12 Security Update : git (SUSE-SU-2017:1357-1)	Nessus	SuSE Local Security Checks	high
100218	Ubuntu 14.04 LTS / 16.04 LTS : Git vulnerability (USN-3287-1)	Nessus	Ubuntu Local Security Checks	high
100200	Fedora 25 : git (2017-f4319b6dfc)	Nessus	Fedora Local Security Checks	high
100111	Debian DSA-3848-1 : git - security update	Nessus	Debian Local Security Checks	high
100110	Debian DLA-938-1 : git security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2017-8386

high

Tenable Plugins

critical

high

high

high

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high

high

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high