Vulnerabilities > CVE-2016-4355 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
gnupg
canonical
CWE-119
nessus

Summary

Multiple integer overflows in ber-decoder.c in Libksba before 1.3.3 allow remote attackers to cause a denial of service (crash) via crafted BER data, which leads to a buffer overflow.

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 familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-2982-1.NASL
    descriptionHanno Bock discovered that Libksba incorrectly handled decoding certain BER data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service. This issue only applied to Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4353) Hanno Bock discovered that Libksba incorrectly handled decoding certain BER data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only applied to Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4354, CVE-2016-4355) Hanno Bock discovered that Libksba incorrectly handled incorrect utf-8 strings when decoding certain DN data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only applied to Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4356) Pascal Cuoq discovered that Libksba incorrectly handled incorrect utf-8 strings when decoding certain DN data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-4574) Pascal Cuoq discovered that Libksba incorrectly handled decoding certain data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service. (CVE-2016-4579). 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 seen2020-06-01
    modified2020-06-02
    plugin id91220
    published2016-05-18
    reporterUbuntu Security Notice (C) 2016-2019 Canonical, Inc. / NASL script (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91220
    titleUbuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : libksba vulnerabilities (USN-2982-1)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were
    # extracted from Ubuntu Security Notice USN-2982-1. The text 
    # itself is copyright (C) Canonical, Inc. See 
    # <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
    # trademark of Canonical, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(91220);
      script_version("2.11");
      script_cvs_date("Date: 2019/09/18 12:31:45");
    
      script_cve_id("CVE-2016-4353", "CVE-2016-4354", "CVE-2016-4355", "CVE-2016-4356", "CVE-2016-4574", "CVE-2016-4579");
      script_xref(name:"USN", value:"2982-1");
    
      script_name(english:"Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : libksba vulnerabilities (USN-2982-1)");
      script_summary(english:"Checks dpkg output for updated package.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Ubuntu host is missing a security-related patch."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Hanno Bock discovered that Libksba incorrectly handled decoding
    certain BER data. An attacker could use this issue to cause Libksba to
    crash, resulting in a denial of service. This issue only applied to
    Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4353)
    
    Hanno Bock discovered that Libksba incorrectly handled decoding
    certain BER data. An attacker could use this issue to cause Libksba to
    crash, resulting in a denial of service, or possibly execute arbitrary
    code. This issue only applied to Ubunt 12.04 LTS and Ubuntu 14.04 LTS.
    (CVE-2016-4354, CVE-2016-4355)
    
    Hanno Bock discovered that Libksba incorrectly handled incorrect
    utf-8 strings when decoding certain DN data. An attacker could use
    this issue to cause Libksba to crash, resulting in a denial of
    service, or possibly execute arbitrary code. This issue only applied
    to Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4356)
    
    Pascal Cuoq discovered that Libksba incorrectly handled incorrect
    utf-8 strings when decoding certain DN data. An attacker could use
    this issue to cause Libksba to crash, resulting in a denial of
    service, or possibly execute arbitrary code. (CVE-2016-4574)
    
    Pascal Cuoq discovered that Libksba incorrectly handled decoding
    certain data. An attacker could use this issue to cause Libksba to
    crash, resulting in a denial of service. (CVE-2016-4579).
    
    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."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://usn.ubuntu.com/2982-1/"
      );
      script_set_attribute(
        attribute:"solution", 
        value:"Update the affected libksba8 package."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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:"exploit_available", value:"false");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libksba8");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:12.04:-:lts");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:15.10");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2016/06/13");
      script_set_attribute(attribute:"patch_publication_date", value:"2016/05/17");
      script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/18");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"Ubuntu Security Notice (C) 2016-2019 Canonical, Inc. / NASL script (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Ubuntu Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("ubuntu.inc");
    include("misc_func.inc");
    
    if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/Ubuntu/release");
    if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
    release = chomp(release);
    if (! preg(pattern:"^(12\.04|14\.04|15\.10|16\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 12.04 / 14.04 / 15.10 / 16.04", "Ubuntu " + release);
    if ( ! get_kb_item("Host/Debian/dpkg-l") ) 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, "Ubuntu", cpu);
    
    flag = 0;
    
    if (ubuntu_check(osver:"12.04", pkgname:"libksba8", pkgver:"1.2.0-2ubuntu0.2")) flag++;
    if (ubuntu_check(osver:"14.04", pkgname:"libksba8", pkgver:"1.3.0-3ubuntu0.14.04.2")) flag++;
    if (ubuntu_check(osver:"15.10", pkgname:"libksba8", pkgver:"1.3.3-1ubuntu0.15.10.1")) flag++;
    if (ubuntu_check(osver:"16.04", pkgname:"libksba8", pkgver:"1.3.3-1ubuntu0.16.04.1")) flag++;
    
    if (flag)
    {
      security_report_v4(
        port       : 0,
        severity   : SECURITY_WARNING,
        extra      : ubuntu_report_get()
      );
      exit(0);
    }
    else
    {
      tested = ubuntu_pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libksba8");
    }
    
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_A113404810C611E694FA002590263BF5.NASL
    descriptionMartin Prpic, Red Hat Product Security Team, reports : Denial of Service due to stack overflow in src/ber-decoder.c. Integer overflow in the BER decoder src/ber-decoder.c. Integer overflow in the DN decoder src/dn.c.
    last seen2020-06-01
    modified2020-06-02
    plugin id90848
    published2016-05-03
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/90848
    titleFreeBSD : libksba -- local denial of service vulnerabilities (a1134048-10c6-11e6-94fa-002590263bf5)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from the FreeBSD VuXML database :
    #
    # Copyright 2003-2018 Jacques Vidrine and contributors
    #
    # Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
    # HTML, PDF, PostScript, RTF and so forth) with or without modification,
    # are permitted provided that the following conditions are met:
    # 1. Redistributions of source code (VuXML) must retain the above
    #    copyright notice, this list of conditions and the following
    #    disclaimer as the first lines of this file unmodified.
    # 2. Redistributions in compiled form (transformed to other DTDs,
    #    published online in any format, converted to PDF, PostScript,
    #    RTF and other formats) must reproduce the above copyright
    #    notice, this list of conditions and the following disclaimer
    #    in the documentation and/or other materials provided with the
    #    distribution.
    # 
    # THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
    # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
    # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
    # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
    # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
    # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
    # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
    # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(90848);
      script_version("2.5");
      script_cvs_date("Date: 2018/11/23 12:49:57");
    
      script_cve_id("CVE-2016-4353", "CVE-2016-4354", "CVE-2016-4355", "CVE-2016-4356");
    
      script_name(english:"FreeBSD : libksba -- local denial of service vulnerabilities (a1134048-10c6-11e6-94fa-002590263bf5)");
      script_summary(english:"Checks for updated package in pkg_info output");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote FreeBSD host is missing a security-related update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Martin Prpic, Red Hat Product Security Team, reports :
    
    Denial of Service due to stack overflow in src/ber-decoder.c.
    
    Integer overflow in the BER decoder src/ber-decoder.c.
    
    Integer overflow in the DN decoder src/dn.c."
      );
      # http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git;a=commit;h=07116a314f4dcd4d96990bbd74db95a03a9f650a
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?c553173e"
      );
      # http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git;a=commit;h=aea7b6032865740478ca4b706850a5217f1c3887
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?1abb5a4d"
      );
      # http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git;a=commit;h=243d12fdec66a4360fbb3e307a046b39b5b4ffc3
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?2ff8ecf3"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://security.gentoo.org/glsa/201604-04"
      );
      # http://www.openwall.com/lists/oss-security/2016/04/29/5
      script_set_attribute(
        attribute:"see_also",
        value:"https://www.openwall.com/lists/oss-security/2016/04/29/5"
      );
      # https://vuxml.freebsd.org/freebsd/a1134048-10c6-11e6-94fa-002590263bf5.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?600868b5"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected package.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:libksba");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2015/04/08");
      script_set_attribute(attribute:"patch_publication_date", value:"2016/05/03");
      script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/03");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"FreeBSD Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("freebsd_package.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
    if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    
    flag = 0;
    
    if (pkg_test(save_report:TRUE, pkg:"libksba<1.3.3")) flag++;
    
    if (flag)
    {
      if (report_verbosity > 0) security_warning(port:0, extra:pkg_report_get());
      else security_warning(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");