contrib/completion/git-prompt.sh in Git before 1.9.3 does not sanitize branch names in the PS1 variable, allowing a malicious repository to cause code execution.

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

  - 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)

  - 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)

  - Git before 2.10.5, 2.11.x before 2.11.4, 2.12.x before     2.12.5, 2.13.x before 2.13.6, and 2.14.x before 2.14.2     uses unsafe Perl scripts to support subcommands such as     cvsserver, which allows attackers to execute arbitrary     OS commands via shell metacharacters in a module name.
    The vulnerable code is reachable via git-shell even     without CVS support.(CVE-2017-14867)

  - 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)

  - An integer truncation flaw and an integer overflow     flaw, both leading to a heap-based buffer overflow,     were found in the way Git processed certain path     information. A remote attacker could create a specially     crafted Git repository that would cause a Git client or     server to crash or, possibly, execute arbitrary     code.(CVE-2016-2324)

  - A flaw was found in the way the git-remote-ext helper     processed certain URLs. If a user had Git configured to     automatically clone submodules from untrusted     repositories, an attacker could inject commands into     the URL of a submodule, allowing them to execute     arbitrary code on the user's system.(CVE-2015-7545)

  - Git before 2.14.5, 2.15.x before 2.15.3, 2.16.x before     2.16.5, 2.17.x before 2.17.2, 2.18.x before 2.18.1, and     2.19.x before 2.19.1 allows remote code execution     during processing of a recursive 'git clone' of a     superproject if a .gitmodules file has a URL field     beginning with a '-' character.(CVE-2018-17456)

  - An integer truncation flaw and an integer overflow     flaw, both leading to a heap-based buffer overflow,     were found in the way Git processed certain path     information. A remote attacker could create a specially     crafted Git repository that would cause a Git client or     server to crash or, possibly, execute arbitrary     code.(CVE-2016-2315)

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)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-2004 advisory.

    - dissalow repo names beginning with dash       Resolves: CVE-2017-8386
    - do not put unsanitized branch names in       Resolves: CVE-2014-9938

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3243-1 advisory.

    It was discovered that Git incorrectly sanitized branch names in the PS1 variable when configured to     display the repository status in the shell prompt. If a user were tricked into exploring a malicious     repository, a remote attacker could use this issue to execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
124923	EulerOS Virtualization 3.0.1.0 : git (EulerOS-SA-2019-1420)	Nessus	Huawei Local Security Checks	critical
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
97938	Ubuntu 14.04 LTS : Git vulnerability (USN-3243-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2014-9938

high

Tenable Plugins

critical

high

high

high

high

high

high

high