Vulnerabilities > CVE-2020-13696 - Incorrect Authorization vulnerability in multiple products

047910
CVSS 4.4 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
LOW
Integrity impact
LOW
Availability impact
NONE
local
low complexity
linuxtv
debian
opensuse
fedoraproject
canonical
CWE-863
nessus
NVD
Published: 2020-06-08
Updated: 2024-11-21

Summary

An issue was discovered in LinuxTV xawtv before 3.107. The function dev_open() in v4l-conf.c does not perform sufficient checks to prevent an unprivileged caller of the program from opening unintended filesystem paths. This allows a local attacker with access to the v4l-conf setuid-root program to test for the existence of arbitrary files and to trigger an open on arbitrary files with mode O_RDWR. To achieve this, relative path components need to be added to the device path, as demonstrated by a v4l-conf -c /dev/../root/.bash_history command.

Vulnerable Configurations

Part Description Count
Application
Linuxtv
15
Application
Opensuse
1
OS
Debian
1
OS
Opensuse
1
OS
Fedoraproject
2
OS
Canonical
1

Common Weakness Enumeration (CWE)

Nessus

NASL familySuSE Local Security Checks
NASL idOPENSUSE-2020-784.NASL
descriptionThis update for xawtv fixes the following issues : - CVE-2020-13696: Fixed an issue in setuid-root program that which could have allowed arbitrary file existence tests and open() with O_RDWR (boo#1171655).
last seen2020-06-10
modified2020-06-08
plugin id137231
published2020-06-08
reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/137231
titleopenSUSE Security Update : xawtv (openSUSE-2020-784)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2020-784.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(137231);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/24");

  script_cve_id("CVE-2020-13696");

  script_name(english:"openSUSE Security Update : xawtv (openSUSE-2020-784)");
  script_summary(english:"Check for the openSUSE-2020-784 patch");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"This update for xawtv fixes the following issues :

  - CVE-2020-13696: Fixed an issue in setuid-root program
    that which could have allowed arbitrary file existence
    tests and open() with O_RDWR (boo#1171655)."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1171655"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Update the affected xawtv packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-13696");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:alevtd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:alevtd-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:motv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:motv-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:pia");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:pia-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:tv-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:tv-common-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:v4l-conf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:v4l-conf-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:v4l-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:v4l-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xawtv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xawtv-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:xawtv-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.1");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/06/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/08");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

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

  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/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE15\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.1", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE15.1", reference:"alevtd-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"alevtd-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"motv-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"motv-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"pia-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"pia-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"tv-common-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"tv-common-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"v4l-conf-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"v4l-conf-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"v4l-tools-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"v4l-tools-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"xawtv-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"xawtv-debuginfo-3.103-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"xawtv-debugsource-3.103-lp151.3.3.1") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
  else security_note(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "alevtd / alevtd-debuginfo / motv / motv-debuginfo / pia / etc");
}

References