Vulnerabilities > CVE-2018-20546 - Integer Overflow or Wraparound vulnerability in multiple products

047910
CVSS 8.1 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
NONE
Availability impact
HIGH

Summary

There is an illegal READ memory access at caca/dither.c (function get_rgba_default) in libcaca 0.99.beta19 for the default bpp case.

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Forced Integer Overflow
    This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.

Nessus

  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-2745-1.NASL
    descriptionThis update for libcaca fixes the following issues : Security issues fixed : CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502) CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584) CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503) CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504) CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589) CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id130166
    published2019-10-23
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/130166
    titleSUSE SLED12 / SLES12 Security Update : libcaca (SUSE-SU-2019:2745-1)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from SUSE update advisory SUSE-SU-2019:2745-1.
    # The text itself is copyright (C) SUSE.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(130166);
      script_version("1.2");
      script_cvs_date("Date: 2019/12/18");
    
      script_cve_id("CVE-2018-20544", "CVE-2018-20545", "CVE-2018-20546", "CVE-2018-20547", "CVE-2018-20548", "CVE-2018-20549");
    
      script_name(english:"SUSE SLED12 / SLES12 Security Update : libcaca (SUSE-SU-2019:2745-1)");
      script_summary(english:"Checks rpm output for the updated packages.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote SUSE host is missing one or more security updates."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "This update for libcaca fixes the following issues :
    
    Security issues fixed :
    
    CVE-2018-20544: Fixed a floating point exception at caca/dither.c
    (bsc#1120502)
    
    CVE-2018-20545: Fixed a WRITE memory access in the load_image function
    at common-image.c for 4bpp (bsc#1120584)
    
    CVE-2018-20546: Fixed a READ memory access in the get_rgba_default
    function at caca/dither.c for bpp (bsc#1120503)
    
    CVE-2018-20547: Fixed a READ memory access in the get_rgba_default
    function at caca/dither.c for 24bpp (bsc#1120504)
    
    CVE-2018-20548: Fixed a WRITE memory access in the load_image function
    at common-image.c for 1bpp (bsc#1120589)
    
    CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read
    function at caca/file.c (bsc#1120470)
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the SUSE security advisory. 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://bugzilla.suse.com/show_bug.cgi?id=1120470"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1120502"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1120503"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1120504"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1120584"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.suse.com/show_bug.cgi?id=1120589"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2018-20544/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2018-20545/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2018-20546/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2018-20547/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2018-20548/"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.suse.com/security/cve/CVE-2018-20549/"
      );
      # https://www.suse.com/support/update/announcement/2019/suse-su-20192745-1/
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?fc470fcb"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "To install this SUSE Security Update use the SUSE recommended
    installation methods like YaST online_update or 'zypper patch'.
    
    Alternatively you can run the command listed for your product :
    
    SUSE Linux Enterprise Software Development Kit 12-SP4:zypper in -t
    patch SUSE-SLE-SDK-12-SP4-2019-2745=1
    
    SUSE Linux Enterprise Server 12-SP4:zypper in -t patch
    SUSE-SLE-SERVER-12-SP4-2019-2745=1
    
    SUSE Linux Enterprise Desktop 12-SP4:zypper in -t patch
    SUSE-SLE-DESKTOP-12-SP4-2019-2745=1"
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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: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:"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:suse_linux:libcaca-debugsource");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcaca0");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcaca0-debuginfo");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/28");
      script_set_attribute(attribute:"patch_publication_date", value:"2019/10/22");
      script_set_attribute(attribute:"plugin_publication_date", value:"2019/10/23");
      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 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/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
    if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
    os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
    os_ver = os_ver[1];
    if (! preg(pattern:"^(SLED12|SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED12 / SLES12", "SUSE " + os_ver);
    
    if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
    
    sp = get_kb_item("Host/SuSE/patchlevel");
    if (isnull(sp)) sp = "0";
    if (os_ver == "SLES12" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP4", os_ver + " SP" + sp);
    if (os_ver == "SLED12" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLED12 SP4", os_ver + " SP" + sp);
    
    
    flag = 0;
    if (rpm_check(release:"SLES12", sp:"4", reference:"libcaca-debugsource-0.99.beta18-14.3.27")) flag++;
    if (rpm_check(release:"SLES12", sp:"4", reference:"libcaca0-0.99.beta18-14.3.27")) flag++;
    if (rpm_check(release:"SLES12", sp:"4", reference:"libcaca0-debuginfo-0.99.beta18-14.3.27")) flag++;
    if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"libcaca-debugsource-0.99.beta18-14.3.27")) flag++;
    if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"libcaca0-0.99.beta18-14.3.27")) flag++;
    if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"libcaca0-debuginfo-0.99.beta18-14.3.27")) flag++;
    
    
    if (flag)
    {
      if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
      else security_warning(0);
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libcaca");
    }
    
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-2745-2.NASL
    descriptionThis update for libcaca fixes the following issues : Security issues fixed : CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502) CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584) CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503) CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504) CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589) CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id130942
    published2019-11-13
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/130942
    titleSUSE SLES12 Security Update : libcaca (SUSE-SU-2019:2745-2)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1631.NASL
    descriptionSeveral vulnerabilities were discovered in libcaca, a graphics library that outputs text: integer overflows, floating point exceptions or invalid memory reads may lead to a denial of service (application crash) if a malformed image file is processed. For Debian 8
    last seen2020-03-17
    modified2019-01-10
    plugin id121055
    published2019-01-10
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121055
    titleDebian DLA-1631-1 : libcaca security update
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2019-0770-1.NASL
    descriptionThis update for libcaca fixes the following issues : Security issues fixed : CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502) CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584) CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503) CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504) CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589) CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id123446
    published2019-03-28
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123446
    titleSUSE SLED15 / SLES15 Security Update : libcaca (SUSE-SU-2019:0770-1)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-1144.NASL
    descriptionThis update for libcaca fixes the following issues : Security issues fixed : - CVE-2018-20544: Fixed a floating point exception at caca/dither.c (bsc#1120502) - CVE-2018-20545: Fixed a WRITE memory access in the load_image function at common-image.c for 4bpp (bsc#1120584) - CVE-2018-20546: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for bpp (bsc#1120503) - CVE-2018-20547: Fixed a READ memory access in the get_rgba_default function at caca/dither.c for 24bpp (bsc#1120504) - CVE-2018-20548: Fixed a WRITE memory access in the load_image function at common-image.c for 1bpp (bsc#1120589) - CVE-2018-20549: Fixed a WRITE memory access in the caca_file_read function at caca/file.c (bsc#1120470) This update was imported from the SUSE:SLE-15:Update update project.
    last seen2020-06-01
    modified2020-06-02
    plugin id123774
    published2019-04-05
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123774
    titleopenSUSE Security Update : libcaca (openSUSE-2019-1144)
  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-3860-1.NASL
    descriptionIt was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-20544) It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to execute arbitrary code. (CVE-2018-20545, CVE-2018-20548, CVE-2018-20459) It was discovered that libcaca incorrectly handled certain images. An attacker could possibly use this issue to access sensitive information. (CVE-2018-20546, CVE-2018-20547). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-18
    modified2019-01-16
    plugin id121212
    published2019-01-16
    reporterUbuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121212
    titleUbuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : libcaca vulnerabilities (USN-3860-1)