Vulnerabilities > CVE-2018-7876 - Resource Exhaustion vulnerability in multiple products

047910
CVSS 6.5 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
libming
debian
CWE-400
nessus

Summary

In libming 0.4.8, a memory exhaustion vulnerability was found in the function parseSWF_ACTIONRECORD in util/parser.c, which allows remote attackers to cause a denial of service via a crafted file.

Vulnerable Configurations

Part Description Count
Application
Libming
1
OS
Debian
1

Common Attack Pattern Enumeration and Classification (CAPEC)

  • XML Ping of the Death
    An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
  • XML Entity Expansion
    An attacker submits an XML document to a target application where the XML document uses nested entity expansion to produce an excessively large output XML. XML allows the definition of macro-like structures that can be used to simplify the creation of complex structures. However, this capability can be abused to create excessive demands on a processor's CPU and memory. A small number of nested expansions can result in an exponential growth in demands on memory.
  • Inducing Account Lockout
    An attacker leverages the security functionality of the system aimed at thwarting potential attacks to launch a denial of service attack against a legitimate system user. Many systems, for instance, implement a password throttling mechanism that locks an account after a certain number of incorrect log in attempts. An attacker can leverage this throttling mechanism to lock a legitimate user out of their own account. The weakness that is being leveraged by an attacker is the very security feature that has been put in place to counteract attacks.
  • Violating Implicit Assumptions Regarding XML Content (aka XML Denial of Service (XDoS))
    XML Denial of Service (XDoS) can be applied to any technology that utilizes XML data. This is, of course, most distributed systems technology including Java, .Net, databases, and so on. XDoS is most closely associated with web services, SOAP, and Rest, because remote service requesters can post malicious XML payloads to the service provider designed to exhaust the service provider's memory, CPU, and/or disk space. The main weakness in XDoS is that the service provider generally must inspect, parse, and validate the XML messages to determine routing, workflow, security considerations, and so on. It is exactly these inspection, parsing, and validation routines that XDoS targets. There are three primary attack vectors that XDoS can navigate Target CPU through recursion: attacker creates a recursive payload and sends to service provider Target memory through jumbo payloads: service provider uses DOM to parse XML. DOM creates in memory representation of XML document, but when document is very large (for example, north of 1 Gb) service provider host may exhaust memory trying to build memory objects. XML Ping of death: attack service provider with numerous small files that clog the system. All of the above attacks exploit the loosely coupled nature of web services, where the service provider has little to no control over the service requester and any messages the service requester sends.

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2019-5139453028.NASL
    descriptionBackport security fixes from [PR#145](https://github.com/libming/libming/pull/145) Fixes: CVE-2018-7866, CVE-2018-7873, CVE-2018-7876, CVE-2018-9009, CVE-2018-9132 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. 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 id129831
    published2019-10-14
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/129831
    titleFedora 30 : ming (2019-5139453028)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Fedora Security Advisory FEDORA-2019-5139453028.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(129831);
      script_version("1.2");
      script_cvs_date("Date: 2019/12/19");
    
      script_cve_id("CVE-2018-7866", "CVE-2018-7873", "CVE-2018-7876", "CVE-2018-9009", "CVE-2018-9132");
      script_xref(name:"FEDORA", value:"2019-5139453028");
    
      script_name(english:"Fedora 30 : ming (2019-5139453028)");
      script_summary(english:"Checks rpm output for the updated package.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Fedora host is missing a security update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Backport security fixes from
    [PR#145](https://github.com/libming/libming/pull/145)
    
    Fixes: CVE-2018-7866, CVE-2018-7873, CVE-2018-7876, CVE-2018-9009,
    CVE-2018-9132
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Fedora update system website.
    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://bodhi.fedoraproject.org/updates/FEDORA-2019-5139453028"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected ming package.");
      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:fedoraproject:fedora:ming");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:30");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/08");
      script_set_attribute(attribute:"patch_publication_date", value:"2019/10/12");
      script_set_attribute(attribute:"plugin_publication_date", value:"2019/10/14");
      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:"Fedora Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
    if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
    os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
    os_ver = os_ver[1];
    if (! preg(pattern:"^30([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 30", "Fedora " + os_ver);
    
    if (!get_kb_item("Host/RedHat/rpm-list")) 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, "Fedora", cpu);
    
    
    flag = 0;
    if (rpm_check(release:"FC30", reference:"ming-0.4.9-0.2.20181112git5009802.fc30")) flag++;
    
    
    if (flag)
    {
      security_report_v4(
        port       : 0,
        severity   : SECURITY_WARNING,
        extra      : rpm_report_get()
      );
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ming");
    }
    
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2019-03AA4F746C.NASL
    descriptionBackport security fixes from [PR#145](https://github.com/libming/libming/pull/145) Fixes: CVE-2018-7866, CVE-2018-7873, CVE-2018-7876, CVE-2018-9009, CVE-2018-9132 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. 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 id129829
    published2019-10-14
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/129829
    titleFedora 29 : ming (2019-03aa4f746c)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1386.NASL
    descriptionMultiple vulnerabilities have been discovered in Ming : CVE-2018-7866 NULL pointer dereference in the newVar3 function (util/decompile.c). Remote attackers might leverage this vulnerability to cause a denial of service via a crafted swf file. CVE-2018-7873 Heap-based buffer overflow vulnerability in the getString function (util/decompile.c). Remote attackers might leverage this vulnerability to cause a denial of service via a crafted swf file. CVE-2018-7876 Integer overflow and resulting memory exhaustion in the parseSWF_ACTIONRECORD function (util/parser.c). Remote attackers might leverage this vulnerability to cause a denial of service via a crafted swf file. CVE-2018-9009 Various heap-based buffer overflow vulnerabilites in util/decompiler.c. Remote attackers might leverage this vulnerability to cause a denial of service via a crafted swf file. CVE-2018-9132 NULL pointer dereference in the getInt function (util/decompile.c). Remote attackers might leverage this vulnerability to cause a denial of service via a crafted swf file. For Debian 7
    last seen2020-03-17
    modified2018-05-29
    plugin id110162
    published2018-05-29
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/110162
    titleDebian DLA-1386-1 : ming security update