Vulnerabilities > CVE-2018-20548 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH

Summary

There is an illegal WRITE memory access at common-image.c (function load_image) in libcaca 0.99.beta19 for 1bpp data.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

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 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)