Vulnerabilities > CVE-2013-4123 - Improper Input Validation vulnerability in multiple products

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
squid-cache
opensuse
CWE-20
nessus
exploit available

Summary

client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a HTTP Host header.

Common Weakness Enumeration (CWE)

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.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Exploit-Db

descriptionSquid 3.3.5 - DoS PoC. CVE-2013-4123. Dos exploit for linux platform
idEDB-ID:26886
last seen2016-02-03
modified2013-07-16
published2013-07-16
reporterkingcope
sourcehttps://www.exploit-db.com/download/26886/
titleSquid 3.3.5 - DoS PoC

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2013-13468.NASL
    descriptionThis is security update that fixes CVE-2013-4123 and CVE-2013-4115. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-17
    modified2013-08-05
    plugin id69201
    published2013-08-05
    reporterThis script is Copyright (C) 2013-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/69201
    titleFedora 19 : squid-3.2.13-1.fc19 (2013-13468)
    code
    #%NASL_MIN_LEVEL 80502
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Fedora Security Advisory 2013-13468.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(69201);
      script_version("1.10");
      script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");
    
      script_cve_id("CVE-2013-4115", "CVE-2013-4123");
      script_bugtraq_id(61111, 61159);
      script_xref(name:"FEDORA", value:"2013-13468");
    
      script_name(english:"Fedora 19 : squid-3.2.13-1.fc19 (2013-13468)");
      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:
    "This is security update that fixes CVE-2013-4123 and CVE-2013-4115.
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Fedora 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.redhat.com/show_bug.cgi?id=983653"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.redhat.com/show_bug.cgi?id=984632"
      );
      # https://lists.fedoraproject.org/pipermail/package-announce/2013-August/113058.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?39ac4bd9"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected squid package.");
      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:POC/RL:OF/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"true");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:squid");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:19");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2013/07/24");
      script_set_attribute(attribute:"plugin_publication_date", value:"2013/08/05");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2013-2020 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 = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
    os_ver = os_ver[1];
    if (! ereg(pattern:"^19([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 19.x", "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:"FC19", reference:"squid-3.2.13-1.fc19")) 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, "squid");
    }
    
  • NASL familyFirewalls
    NASL idSQUID_3_2_13.NASL
    descriptionAccording to its banner, the version of Squid running on the remote host is 3.2.x prior to 3.2.13 or 3.3.x prior to 3.3.8. It is, therefore, affected by a denial of service vulnerability. The vulnerability exists when handling a port number in the host header of a specially crafted HTTP Request. Note that Nessus has relied only on the version in the proxy server
    last seen2020-06-01
    modified2020-06-02
    plugin id69042
    published2013-07-24
    reporterThis script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/69042
    titleSquid 3.2.x < 3.2.13 / 3.3.x < 3.3.8 Port Handling DoS
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(69042);
      script_version("1.7");
      script_cvs_date("Date: 2018/11/15 20:50:22");
    
      script_cve_id("CVE-2013-4123");
      script_bugtraq_id(61159, 61182);
      script_xref(name:"EDB-ID", value:"26886");
    
      script_name(english:"Squid 3.2.x < 3.2.13 / 3.3.x < 3.3.8 Port Handling DoS");
      script_summary(english:"Checks version of Squid");
    
      script_set_attribute(attribute:"synopsis", value:
    "The remote proxy server is affected by a denial of service
    vulnerability.");
      script_set_attribute(attribute:"description", value:
    "According to its banner, the version of Squid running on the remote
    host is 3.2.x prior to 3.2.13 or 3.3.x prior to 3.3.8.  It is,
    therefore, affected by a denial of service vulnerability.  The
    vulnerability exists when handling a port number in the host header of a
    specially crafted HTTP Request. 
    
    Note that Nessus has relied only on the version in the proxy server's
    banner, which is not updated by the patch that the project has released
    to address this issue.  If this patch has been applied properly and the
    service has been restarted, consider this to be a false positive.");
      script_set_attribute(attribute:"see_also", value:"http://www.squid-cache.org/Advisories/SQUID-2013_3.txt");
      script_set_attribute(attribute:"see_also", value:"https://seclists.org/bugtraq/2013/Jul/98");
      script_set_attribute(attribute:"solution", value:
    "Either upgrade to Squid version 3.2.13 / 3.3.8 or later, or apply the
    vendor-supplied patch.");
      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:POC/RL:OF/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"true");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2013/07/13");
      script_set_attribute(attribute:"patch_publication_date", value:"2013/07/13");
      script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/24");
    
      script_set_attribute(attribute:"potential_vulnerability", value:"true");
      script_set_attribute(attribute:"plugin_type", value:"remote");
      script_set_attribute(attribute:"cpe", value:"cpe:/a:squid-cache:squid");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_family(english:"Firewalls");
    
      script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.");
    
      script_dependencies("squid_version.nasl");
      script_require_keys("www/squid", "Settings/ParanoidReport");
      script_require_ports("Services/http_proxy", 3128, 8080);
    
      exit(0);
    }
    
    include("audit.inc");
    include("global_settings.inc");
    include("misc_func.inc");
    
    # Build a list of ports from the
    list = get_kb_list("http_proxy/*/squid/version");
    if (isnull(list)) audit(AUDIT_NOT_INST, "Squid");
    
    # nb: banner checks of open source software are prone to false-
    #     positives so only run the check if reporting is paranoid.
    if (report_paranoia < 2) audit(AUDIT_PARANOID);
    
    vulnerable = FALSE;
    not_vuln_list = make_list();
    
    foreach item (keys(list))
    {
      port = ereg_replace(pattern:'^http_proxy/([0-9]+)/squid/version', replace:'\\1', string:item);
      version = list[item];
      # Affected:
    
      # Squid 3.2.x < 3.2.13
      # Squid 3.3.x < 3.3.8
      if (
        version =~ "^3\.2\.([0-9]|1[0-2])([^0-9]|$)" ||
        version =~ "^3\.3\.[0-7]([^0-9]|$)"
      )
      {
        vulnerable = TRUE;
        if (report_verbosity > 0)
        {
          source = get_kb_item('http_proxy/'+port+'/squid/source');
          report =
            '\n  Version source    : ' + source +
            '\n  Installed version : ' + version +
            '\n  Fixed version     : 3.2.13 / 3.3.8' + '\n';
          security_warning(port:port, extra:report);
        }
        else security_warning(port:port);
      }
      else not_vuln_list = make_list(not_vuln_list, version + " on port " + port);
    }
    
    if (vulnerable) exit(0);
    else
    {
      installs = max_index(not_vuln_list);
      if (installs == 0) audit(AUDIT_NOT_INST, "Squid");
      else if (installs == 1)
        audit(AUDIT_INST_VER_NOT_VULN, "Squid", not_vuln_list[0]);
      else
        exit(0, "The Squid installs ("+ join(not_vuln_list, sep:", ") + ") are not affected.");
    }
    
  • NASL familySolaris Local Security Checks
    NASL idSOLARIS11_SQUID_20140114.NASL
    descriptionThe remote Solaris system is missing necessary patches to address security updates : - client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a HTTP Host header. (CVE-2013-4123)
    last seen2020-06-01
    modified2020-06-02
    plugin id80774
    published2015-01-19
    reporterThis script is Copyright (C) 2015-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/80774
    titleOracle Solaris Third-Party Patch Update : squid (cve_2013_4123_input_validation)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2013-13493.NASL
    descriptionThis is security update that fixes CVE-2013-4123 and CVE-2013-4115. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-17
    modified2013-08-05
    plugin id69204
    published2013-08-05
    reporterThis script is Copyright (C) 2013-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/69204
    titleFedora 18 : squid-3.2.13-1.fc18 (2013-13493)
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_30A04AB4ED7B11E286438C705AF55518.NASL
    descriptionSquid project reports : Due to incorrect data validation Squid is vulnerable to a denial of service attack when processing specially crafted HTTP requests This problem allows any client who can generate HTTP requests to perform a denial of service attack on the Squid service.
    last seen2020-06-01
    modified2020-06-02
    plugin id68898
    published2013-07-16
    reporterThis script is Copyright (C) 2013-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/68898
    titleFreeBSD : squid -- denial of service (30a04ab4-ed7b-11e2-8643-8c705af55518)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2013-699.NASL
    descriptionThis squid update includes several security fixes and minor changes. - squid-3.2.x-11823-bnc829084-CVE-2013-4115.diff fixes a buffer overflow involving very long hostnames. [bnc#829084] CVE-2013-4115 - squid-3.2.x-11823-bnc830319-CVE-2013-4123.diff fixes problems identifying a port number as specified by the client. [bnc#830319] CVE-2013-4123 - run logrotate as squid:nogroup [bnc#677335]
    last seen2020-06-05
    modified2014-06-13
    plugin id75140
    published2014-06-13
    reporterThis script is Copyright (C) 2014-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/75140
    titleopenSUSE Security Update : squid (openSUSE-SU-2013:1435-1)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201309-22.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201309-22 (Squid: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Squid. Please review the CVE identifiers referenced below for details. Impact : A remote attacker may be able to bypass ACL restrictions or cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id70182
    published2013-09-28
    reporterThis script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/70182
    titleGLSA-201309-22 : Squid: Multiple vulnerabilities