Debian DLA-2936-1 : libgit2 - LTS security update - Nessus

High Plugin ID: 159090

This page contains detailed information about the Debian DLA-2936-1 : libgit2 - LTS security update Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 159090
Name: Debian DLA-2936-1 : libgit2 - LTS security update
Filename: debian_DLA-2936.nasl
Vulnerability Published: 2018-03-12
This Plugin Published: 2022-03-21
Last Modification Time: 2022-03-21
Plugin Version: 1.2
Plugin Type: local
Plugin Family: Debian Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Debian/dpkg-l, Host/Debian/release, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2018-03-12
Patch Published: 2022-03-21
CVE [?]: CVE-2018-8098, CVE-2018-8099, CVE-2018-10887, CVE-2018-10888, CVE-2018-15501, CVE-2019-1352, CVE-2019-1353, CVE-2020-12278, CVE-2020-12279
CPE [?]: cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:libgit2-24, p-cpe:/a:debian:debian_linux:libgit2-dev

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2936 advisory.

- A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak memory addresses or cause a Denial of Service. (CVE-2018-10887)

- A flaw was found in libgit2 before version 0.27.3. A missing check in git_delta_apply function in delta.c file, may lead to an out-of-bound read while reading a binary delta file. An attacker may use this flaw to cause a Denial of Service. (CVE-2018-10888)

- In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker can send a crafted smart-protocol ng packet that lacks a '\0' byte to trigger an out-of-bounds read that leads to DoS. (CVE-2018-15501)

- Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted repository index file. (CVE-2018-8098)

- Incorrect returning of an error code in the index.c:read_entry() function leads to a double free in libgit2 before v0.26.2, which allows an attacker to cause a denial of service via a crafted repository index file. (CVE-2018-8099)

- A remote code execution vulnerability exists when Git for Visual Studio improperly sanitizes input, aka 'Git for Visual Studio Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-1349, CVE-2019-1350, CVE-2019-1354, CVE-2019-1387. (CVE-2019-1352)

- An issue was found in Git before v2.24.1, v2.23.1, v2.22.2, v2.21.1, v2.20.2, v2.19.3, v2.18.2, v2.17.3, v2.16.6, v2.15.4, and v2.14.6. When running Git in the Windows Subsystem for Linux (also known as WSL) while accessing a working directory on a regular Windows drive, none of the NTFS protections were active. (CVE-2019-1353)

- An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. path.c mishandles equivalent filenames that exist because of NTFS Alternate Data Streams. This may allow remote code execution when cloning a repository. This issue is similar to CVE-2019-1352. (CVE-2020-12278)

- An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. checkout.c mishandles equivalent filenames that exist because of NTFS short names. This may allow remote code execution when cloning a repository. This issue is similar to CVE-2019-1353. (CVE-2020-12279)

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

Solution

Upgrade the libgit2 packages.

For Debian 9 stretch, these problems have been fixed in version 0.25.1+really0.24.6-1+deb9u1.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the Debian DLA-2936-1 : libgit2 - LTS security update vulnerability:

GitHub: https://github.com/meherarfaoui09/meher
[CVE-2019-1352]
GitHub: https://github.com/meherarfaoui09/meher
[CVE-2019-1353]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2019-1352
CVSS V2 Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C

CVSS Base Score:	9.3 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.6
CVSS Temporal Score:	6.9 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.9 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	7.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.7 (High)

STIG Severity [?]: I
STIG Risk Rating: High

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-2936. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(159090);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/03/21");

  script_cve_id(
    "CVE-2018-8098",
    "CVE-2018-8099",
    "CVE-2018-10887",
    "CVE-2018-10888",
    "CVE-2018-15501",
    "CVE-2019-1352",
    "CVE-2019-1353",
    "CVE-2020-12278",
    "CVE-2020-12279"
  );
  script_xref(name:"IAVA", value:"2019-A-0454-S");

  script_name(english:"Debian DLA-2936-1 : libgit2 - LTS security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-2936 advisory.

  - A flaw was found in libgit2 before version 0.27.3. It has been discovered that an unexpected sign
    extension in git_delta_apply function in delta.c file may lead to an integer overflow which in turn leads
    to an out of bound read, allowing to read before the base object. An attacker may use this flaw to leak
    memory addresses or cause a Denial of Service. (CVE-2018-10887)

  - A flaw was found in libgit2 before version 0.27.3. A missing check in git_delta_apply function in delta.c
    file, may lead to an out-of-bound read while reading a binary delta file. An attacker may use this flaw to
    cause a Denial of Service. (CVE-2018-10888)

  - In ng_pkt in transports/smart_pkt.c in libgit2 before 0.26.6 and 0.27.x before 0.27.4, a remote attacker
    can send a crafted smart-protocol ng packet that lacks a '\0' byte to trigger an out-of-bounds read that
    leads to DoS. (CVE-2018-15501)

  - Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in
    libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted
    repository index file. (CVE-2018-8098)

  - Incorrect returning of an error code in the index.c:read_entry() function leads to a double free in
    libgit2 before v0.26.2, which allows an attacker to cause a denial of service via a crafted repository
    index file. (CVE-2018-8099)

  - A remote code execution vulnerability exists when Git for Visual Studio improperly sanitizes input, aka
    'Git for Visual Studio Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-1349,
    CVE-2019-1350, CVE-2019-1354, CVE-2019-1387. (CVE-2019-1352)

  - An issue was found in Git before v2.24.1, v2.23.1, v2.22.2, v2.21.1, v2.20.2, v2.19.3, v2.18.2, v2.17.3,
    v2.16.6, v2.15.4, and v2.14.6. When running Git in the Windows Subsystem for Linux (also known as WSL)
    while accessing a working directory on a regular Windows drive, none of the NTFS protections were active.
    (CVE-2019-1353)

  - An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. path.c mishandles equivalent
    filenames that exist because of NTFS Alternate Data Streams. This may allow remote code execution when
    cloning a repository. This issue is similar to CVE-2019-1352. (CVE-2020-12278)

  - An issue was discovered in libgit2 before 0.28.4 and 0.9x before 0.99.0. checkout.c mishandles equivalent
    filenames that exist because of NTFS short names. This may allow remote code execution when cloning a
    repository. This issue is similar to CVE-2019-1353. (CVE-2020-12279)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892961");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/libgit2");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2022/dla-2936");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-10887");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-10888");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-15501");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-8098");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2018-8099");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-1352");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-1353");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-12278");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-12279");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/libgit2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libgit2 packages.

For Debian 9 stretch, these problems have been fixed in version 0.25.1+really0.24.6-1+deb9u1.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-1352");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/03/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/03/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgit2-24");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgit2-dev");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('audit.inc');
include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var release = get_kb_item('Host/Debian/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Debian');
var release = chomp(release);
if (! preg(pattern:"^(9)\.[0-9]+", string:release)) audit(AUDIT_OS_NOT, 'Debian 9.0', 'Debian ' + release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '9.0', 'prefix': 'libgit2-24', 'reference': '0.25.1+really0.24.6-1+deb9u1'},
    {'release': '9.0', 'prefix': 'libgit2-dev', 'reference': '0.25.1+really0.24.6-1+deb9u1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (release && prefix && reference) {
    if (deb_check(release:release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libgit2-24 / libgit2-dev');
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/debian_DLA-2936.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\debian_DLA-2936.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/debian_DLA-2936.nasl

Go back to menu.

How to Run

Here is how to run the Debian DLA-2936-1 : libgit2 - LTS security update as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Debian Local Security Checks plugin family.
On the right side table select Debian DLA-2936-1 : libgit2 - LTS security update plugin ID 159090.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl debian_DLA-2936.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a debian_DLA-2936.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - debian_DLA-2936.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state debian_DLA-2936.nasl -t <IP/HOST>

Go back to menu.

References

IAVA | Information Assurance Vulnerability Alert:

2019-A-0454-S

See also:

Similar and related Nessus plugins:

132259 - Amazon Linux 2 : git (ALAS-2019-1371)
132026 - Amazon Linux AMI : git (ALAS-2019-1325)
145577 - CentOS 8 : git (CESA-2019:4356)
133218 - Debian DLA-2059-1 : git security update
131966 - Debian DSA-4581-1 : git - security update
133902 - EulerOS 2.0 SP5 : git (EulerOS-SA-2020-1101)
133985 - EulerOS 2.0 SP8 : git (EulerOS-SA-2020-1151)
135148 - EulerOS Virtualization for ARM 64 3.0.6.0 : git (EulerOS-SA-2020-1361)
136240 - EulerOS Virtualization for ARM 64 3.0.2.0 : git (EulerOS-SA-2020-1537)
132639 - Fedora 30 : git (2019-1cec196e20)
132084 - Fedora 31 : libgit2 (2019-9c3d054f39)
132119 - Fedora 31 : git (2019-c841bcc3b9)
134607 - GLSA-202003-30 : Git: Multiple vulnerabilities
118486 - openSUSE Security Update : libgit2 (openSUSE-2018-1314)
112139 - openSUSE Security Update : libgit2 (openSUSE-2018-922)
123276 - openSUSE Security Update : libgit2 (openSUSE-2019-638)
133344 - openSUSE Security Update : git (openSUSE-2020-123)
136311 - openSUSE Security Update : git (openSUSE-2020-598)
132381 - Oracle Linux 8 : git (ELSA-2019-4356)
132331 - RHEL 8 : git (RHSA-2019:4356)
133281 - RHEL 8 : git (RHSA-2020:0228)
131939 - Security Updates for Microsoft Visual Studio Products (December 2019)
120086 - SUSE SLED15 / SLES15 Security Update : libgit2 (SUSE-SU-2018:2469-1)
132093 - SUSE SLES12 Security Update : git (SUSE-SU-2019:3311-1)
132745 - SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2020:0045-1)
135580 - SUSE SLES12 Security Update : git (SUSE-SU-2020:0992-1)
136074 - SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2020:1121-1)
132015 - Ubuntu 16.04 LTS / 18.04 LTS / 19.04 / 19.10 : Git vulnerabilities (USN-4220-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file debian_DLA-2936.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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Debian DLA-2936-1 : libgit2 - LTS security update - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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