Vulnerabilities > CVE-2015-3236 - Information Exposure vulnerability in Haxx Curl and Libcurl
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
NONE Availability impact
NONE 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.
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 8 |
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 family Fedora Local Security Checks NASL id FEDORA_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 seen 2020-06-05 modified 2015-06-25 plugin id 84376 published 2015-06-25 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/84376 title Fedora 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 family Slackware Local Security Checks NASL id SLACKWARE_SSA_2015-302-01.NASL description New curl packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues. last seen 2020-06-01 modified 2020-06-02 plugin id 86662 published 2015-10-30 reporter This script is Copyright (C) 2015-2016 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/86662 title Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : curl (SSA:2015-302-01) NASL family SuSE Local Security Checks NASL id OPENSUSE-2015-446.NASL description Curl 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 seen 2020-06-05 modified 2015-06-25 plugin id 84387 published 2015-06-25 reporter This script is Copyright (C) 2015-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/84387 title openSUSE Security Update : curl (openSUSE-2015-446) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201509-02.NASL description The 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 seen 2020-06-01 modified 2020-06-02 plugin id 86133 published 2015-09-25 reporter This script is Copyright (C) 2015-2016 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/86133 title GLSA-201509-02 : cURL: Multiple vulnerabilities NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_2438D4AF153811E5A1063C970E169BC2.NASL description cURL 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 seen 2020-06-01 modified 2020-06-02 plugin id 84254 published 2015-06-18 reporter This script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/84254 title FreeBSD : cURL -- Multiple Vulnerability (2438d4af-1538-11e5-a106-3c970e169bc2) NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2015-551.NASL description As 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 seen 2020-06-01 modified 2020-06-02 plugin id 84293 published 2015-06-22 reporter This script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/84293 title Amazon Linux AMI : curl (ALAS-2015-551)
References
- http://curl.haxx.se/docs/adv_20150617A.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160660.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- http://www.securityfocus.com/bid/75385
- http://www.securityfocus.com/bid/91787
- https://kc.mcafee.com/corporate/index?page=content&id=SB10131
- https://security.gentoo.org/glsa/201509-02