Vulnerabilities > CVE-2015-3236 - Information Exposure vulnerability in Haxx Curl and Libcurl

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
NONE
Availability impact
NONE
network
low complexity
haxx
CWE-200
nessus

Summary

cURL and libcurl 7.40.0 through 7.42.1 send the HTTP Basic authentication credentials for a previous connection when reusing a reset (curl_easy_reset) connection handle to send a request to the same host name, which allows remote attackers to obtain sensitive information via unspecified vectors.

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Subverting Environment Variable Values
    The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
  • Footprinting
    An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Browser Fingerprinting
    An attacker carefully crafts small snippets of Java Script to efficiently detect the type of browser the potential victim is using. Many web-based attacks need prior knowledge of the web browser including the version of browser to ensure successful exploitation of a vulnerability. Having this knowledge allows an attacker to target the victim with attacks that specifically exploit known or zero day weaknesses in the type and version of the browser used by the victim. Automating this process via Java Script as a part of the same delivery system used to exploit the browser is considered more efficient as the attacker can supply a browser fingerprinting method and integrate it with exploit code, all contained in Java Script and in response to the same web page request by the browser.
  • Session Credential Falsification through Prediction
    This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.

Nessus

  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2015-10155.NASL
    description - implement public key pinning for NSS backend (#1195771) - fix lingering HTTP credentials in connection re-use (CVE-2015-3236) - prevent SMB from sending off unrelated memory contents (CVE-2015-3237) - curl-config --libs now works on x86_64 without libcurl-devel.x86_64 (#1228363) 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 seen2020-06-05
    modified2015-06-25
    plugin id84376
    published2015-06-25
    reporterThis script is Copyright (C) 2015-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/84376
    titleFedora 22 : curl-7.40.0-5.fc22 (2015-10155)
    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 2015-10155.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(84376);
      script_version("2.5");
      script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");
    
      script_cve_id("CVE-2015-3236", "CVE-2015-3237");
      script_xref(name:"FEDORA", value:"2015-10155");
    
      script_name(english:"Fedora 22 : curl-7.40.0-5.fc22 (2015-10155)");
      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:
    "  - implement public key pinning for NSS backend (#1195771)
    
        - fix lingering HTTP credentials in connection re-use
          (CVE-2015-3236)
    
        - prevent SMB from sending off unrelated memory contents
          (CVE-2015-3237)
    
        - curl-config --libs now works on x86_64 without
          libcurl-devel.x86_64 (#1228363)
    
    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=1233814"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.redhat.com/show_bug.cgi?id=1233816"
      );
      # https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160660.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?76c0d4d9"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected curl package.");
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P");
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:curl");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:22");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2015/06/20");
      script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/25");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2015-2020 Tenable Network Security, Inc.");
      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:"^22([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 22.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:"FC22", reference:"curl-7.40.0-5.fc22")) 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, "curl");
    }
    
  • NASL familySlackware Local Security Checks
    NASL idSLACKWARE_SSA_2015-302-01.NASL
    descriptionNew curl packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id86662
    published2015-10-30
    reporterThis script is Copyright (C) 2015-2016 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/86662
    titleSlackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : curl (SSA:2015-302-01)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2015-446.NASL
    descriptionCurl was updated to fix two security issues and enable metalink support The following vulnerabilities were fixed : - CVE-2015-3236: libcurl could have wrongly send HTTP credentials when re-using connections (boo#934501) - CVE-2015-3237: libcurl could have been tricked by a malicious SMB server to send off data it did not intend to (boo#934502) The following feature was enabled : - boo#851126: enable metalink support.
    last seen2020-06-05
    modified2015-06-25
    plugin id84387
    published2015-06-25
    reporterThis script is Copyright (C) 2015-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/84387
    titleopenSUSE Security Update : curl (openSUSE-2015-446)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201509-02.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201509-02 (cURL: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in cURL. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could possibly obtain sensitive information, or cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id86133
    published2015-09-25
    reporterThis script is Copyright (C) 2015-2016 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/86133
    titleGLSA-201509-02 : cURL: Multiple vulnerabilities
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_2438D4AF153811E5A1063C970E169BC2.NASL
    descriptioncURL reports : libcurl can wrongly send HTTP credentials when re-using connections. libcurl allows applications to set credentials for the upcoming transfer with HTTP Basic authentication, like with CURLOPT_USERPWD for example. Name and password. Just like all other libcurl options the credentials are sticky and are kept associated with the
    last seen2020-06-01
    modified2020-06-02
    plugin id84254
    published2015-06-18
    reporterThis script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/84254
    titleFreeBSD : cURL -- Multiple Vulnerability (2438d4af-1538-11e5-a106-3c970e169bc2)
  • NASL familyAmazon Linux Local Security Checks
    NASL idALA_ALAS-2015-551.NASL
    descriptionAs discussed upstream, libcurl can wrongly send HTTP credentials when re-using connections. (CVE-2015-3236) Also discussed upstream, libcurl can get tricked by a malicious SMB server to send off data it did not intend to. (CVE-2015-3237)
    last seen2020-06-01
    modified2020-06-02
    plugin id84293
    published2015-06-22
    reporterThis script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/84293
    titleAmazon Linux AMI : curl (ALAS-2015-551)