Fedora 24 : git (2017-01a7989fc0)

2017-05-30T00:00:00
ID FEDORA_2017-01A7989FC0.NASL
Type nessus
Reporter This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2017-05-30T00:00:00

Description

An issue in git-shell could allow remote users to run an interactive pager. From the update announcement :

... 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).

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.

                                        
                                            #%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2017-01a7989fc0.
#

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

if (description)
{
  script_id(100485);
  script_version("3.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2017-8386");
  script_xref(name:"FEDORA", value:"2017-01a7989fc0");

  script_name(english:"Fedora 24 : git (2017-01a7989fc0)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bodhi.fedoraproject.org/updates/FEDORA-2017-01a7989fc0"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/git/git/commit/3ec804490"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected git package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:git");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:24");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/05/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/05/30");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^24([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 24", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC24", reference:"git-2.7.5-1.fc24")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "git");
}