Vulnerabilities > CVE-2019-6286 - Out-of-bounds Read vulnerability in Sass-Lang Libsass 3.5.5

047910
CVSS 4.3 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
sass-lang
CWE-125
nessus

Summary

In LibSass 3.5.5, a heap-based buffer over-read exists in Sass::Prelexer::skip_over_scopes in prelexer.hpp when called from Sass::Parser::parse_import(), a similar issue to CVE-2018-11693.

Vulnerable Configurations

Part Description Count
Application
Sass-Lang
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Overread Buffers
    An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.

Nessus

NASL familySuSE Local Security Checks
NASL idOPENSUSE-2019-1791.NASL
descriptionThis update for libsass to version 3.6.1 fixes the following issues : Security issues fixed : - CVE-2019-6283: Fixed heap-buffer-overflow in Sass::Prelexer::parenthese_scope(char const*) (boo#1121943). - CVE-2019-6284: Fixed heap-based buffer over-read exists in Sass:Prelexer:alternatives (boo#1121944). - CVE-2019-6286: Fixed heap-based buffer over-read exists in Sass:Prelexer:skip_over_scopes (boo#1121945). - CVE-2018-11499: Fixed use-after-free vulnerability in sass_context.cpp:handle_error (boo#1096894). - CVE-2018-19797: Disallowed parent selector in selector_fns arguments (boo#1118301). - CVE-2018-19827: Fixed use-after-free vulnerability exists in the SharedPtr class (boo#1118346). - CVE-2018-19837: Fixed stack overflow in Eval::operator() (boo#1118348). - CVE-2018-19838: Fixed stack-overflow at IMPLEMENT_AST_OPERATORS expansion (boo#1118349). - CVE-2018-19839: Fixed buffer-overflow (OOB read) against some invalid input (boo#1118351). - CVE-2018-20190: Fixed NULL pointer dereference in Sass::Eval::operator()(Sass::Supports_Operator*) (boo#1119789). - CVE-2018-20821: Fixed uncontrolled recursion in Sass:Parser:parse_css_variable_value (boo#1133200). - CVE-2018-20822: Fixed stack-overflow at Sass::Inspect::operator() (boo#1133201).
last seen2020-06-01
modified2020-06-02
plugin id126975
published2019-07-24
reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/126975
titleopenSUSE Security Update : libsass (openSUSE-2019-1791)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2019-1791.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(126975);
  script_version("1.2");
  script_cvs_date("Date: 2020/01/06");

  script_cve_id("CVE-2018-11499", "CVE-2018-19797", "CVE-2018-19827", "CVE-2018-19837", "CVE-2018-19838", "CVE-2018-19839", "CVE-2018-20190", "CVE-2018-20821", "CVE-2018-20822", "CVE-2019-6283", "CVE-2019-6284", "CVE-2019-6286");

  script_name(english:"openSUSE Security Update : libsass (openSUSE-2019-1791)");
  script_summary(english:"Check for the openSUSE-2019-1791 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 libsass to version 3.6.1 fixes the following issues :

Security issues fixed :

  - CVE-2019-6283: Fixed heap-buffer-overflow in
    Sass::Prelexer::parenthese_scope(char const*)
    (boo#1121943).

  - CVE-2019-6284: Fixed heap-based buffer over-read exists
    in Sass:Prelexer:alternatives (boo#1121944).

  - CVE-2019-6286: Fixed heap-based buffer over-read exists
    in Sass:Prelexer:skip_over_scopes (boo#1121945).

  - CVE-2018-11499: Fixed use-after-free vulnerability in
    sass_context.cpp:handle_error (boo#1096894).

  - CVE-2018-19797: Disallowed parent selector in
    selector_fns arguments (boo#1118301).

  - CVE-2018-19827: Fixed use-after-free vulnerability
    exists in the SharedPtr class (boo#1118346).

  - CVE-2018-19837: Fixed stack overflow in Eval::operator()
    (boo#1118348).

  - CVE-2018-19838: Fixed stack-overflow at
    IMPLEMENT_AST_OPERATORS expansion (boo#1118349).

  - CVE-2018-19839: Fixed buffer-overflow (OOB read) against
    some invalid input (boo#1118351).

  - CVE-2018-20190: Fixed NULL pointer dereference in
    Sass::Eval::operator()(Sass::Supports_Operator*)
    (boo#1119789).

  - CVE-2018-20821: Fixed uncontrolled recursion in
    Sass:Parser:parse_css_variable_value (boo#1133200).

  - CVE-2018-20822: Fixed stack-overflow at
    Sass::Inspect::operator() (boo#1133201)."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1096894"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1118301"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1118346"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1118348"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1118349"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1118351"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1119789"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1121943"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1121944"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1121945"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1133200"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1133201"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libsass packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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:N/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:"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:libsass-3_6_1-1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libsass-3_6_1-1-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libsass-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libsass-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.1");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/05/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/07/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/24");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 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\.0|SUSE15\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.0 / 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:"SUSE15.0", reference:"libsass-3_6_1-1-3.6.1-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"libsass-3_6_1-1-debuginfo-3.6.1-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"libsass-debugsource-3.6.1-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"libsass-devel-3.6.1-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"libsass-3_6_1-1-3.6.1-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"libsass-3_6_1-1-debuginfo-3.6.1-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"libsass-debugsource-3.6.1-lp151.3.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.1", reference:"libsass-devel-3.6.1-lp151.3.3.1") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libsass-3_6_1-1 / libsass-3_6_1-1-debuginfo / libsass-debugsource / etc");
}