ID CVE-2016-0755
Summary The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which might allow remote attackers to authenticate as other users via a request, a similar issue to CVE-2014-0015.
References
Vulnerable Configurations
  • Haxx Curl 7.46.0
    cpe:2.3:a:haxx:curl:7.46.0
  • Canonical Ubuntu Linux 12.04 LTS
    cpe:2.3:o:canonical:ubuntu_linux:12.04:-:-:-:lts
  • Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)
    cpe:2.3:o:canonical:ubuntu_linux:14.04:-:-:-:lts
  • Canonical Ubuntu Linux 15.04
    cpe:2.3:o:canonical:ubuntu_linux:15.04
  • Canonical Ubuntu Linux 15.10
    cpe:2.3:o:canonical:ubuntu_linux:15.10
  • Debian Linux 7.0
    cpe:2.3:o:debian:debian_linux:7.0
CVSS
Base: 5.0 (as of 16-02-2016 - 13:01)
Impact:
Exploitability:
CWE CWE-287
CAPEC
  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • 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.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE PARTIAL NONE
nessus via4
  • NASL family FreeBSD Local Security Checks
    NASL id FREEBSD_PKG_8B27F1BCC50911E5A95FB499BAEBFEAF.NASL
    description The cURL project reports : libcurl will reuse NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for this transfer.
    last seen 2019-02-21
    modified 2018-12-19
    plugin id 88476
    published 2016-01-29
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88476
    title FreeBSD : curl -- Credentials not checked (8b27f1bc-c509-11e5-a95f-b499baebfeaf)
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2016-170.NASL
    description This update for curl fixes the following issues : - CVE-2016-0755: libcurl would reuse NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for this transfer (bsc#962983) The following tracked bugs only affect the test suite : - bsc#962996: Expired cookie in test 46 caused test failures
    last seen 2019-02-21
    modified 2016-10-13
    plugin id 88634
    published 2016-02-09
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88634
    title openSUSE Security Update : curl (openSUSE-2016-170)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-5A141DE5D9.NASL
    description Update to 7.47.0 which fixes various CVE's 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 2019-02-21
    modified 2016-10-18
    plugin id 89551
    published 2016-03-04
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=89551
    title Fedora 22 : mingw-curl-7.47.0-1.fc22 (2016-5a141de5d9)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2016-0347-1.NASL
    description This update for curl fixes the following issues : - CVE-2016-0755: libcurl would reuse NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for this transfer (bsc#962983) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 88622
    published 2016-02-08
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88622
    title SUSE SLED11 / SLES11 Security Update : curl (SUSE-SU-2016:0347-1)
  • NASL family MacOS X Local Security Checks
    NASL id MACOS_10_12.NASL
    description The remote host is running a version of Mac OS X that is prior to 10.10.5, 10.11.x prior to 10.11.6, or is not macOS 10.12. It is, therefore, affected by multiple vulnerabilities in the following components : - apache - apache_mod_php - Apple HSSPI Support - AppleEFIRuntime - AppleMobileFileIntegrity - AppleUCC - Application Firewall - ATS - Audio - Bluetooth - cd9660 - CFNetwork - CommonCrypto - CoreCrypto - CoreDisplay - curl - Date & Time Pref Pane - DiskArbitration - File Bookmark - FontParser - IDS - Connectivity - ImageIO - Intel Graphics Driver - IOAcceleratorFamily - IOThunderboltFamily - Kerberos v5 PAM module - Kernel - libarchive - libxml2 - libxpc - libxslt - mDNSResponder - NSSecureTextField - Perl - S2 Camera - Security - Terminal - WindowServer Note that successful exploitation of the most serious issues can result in arbitrary code execution.
    last seen 2019-02-21
    modified 2018-07-14
    plugin id 93685
    published 2016-09-23
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=93685
    title macOS < 10.12 Multiple Vulnerabilities
  • NASL family Slackware Local Security Checks
    NASL id SLACKWARE_SSA_2016-039-01.NASL
    description New curl packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix a security issue.
    last seen 2019-02-21
    modified 2016-10-19
    plugin id 88625
    published 2016-02-09
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88625
    title Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : curl (SSA:2016-039-01)
  • NASL family Ubuntu Local Security Checks
    NASL id UBUNTU_USN-2882-1.NASL
    description Isaac Boukris discovered that curl could incorrectly re-use NTLM proxy credentials when subsequently connecting to the same host. 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 seen 2019-02-21
    modified 2018-12-01
    plugin id 88457
    published 2016-01-28
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88457
    title Ubuntu 12.04 LTS / 14.04 LTS / 15.04 / 15.10 : curl vulnerability (USN-2882-1)
  • NASL family Amazon Linux Local Security Checks
    NASL id ALA_ALAS-2016-652.NASL
    description The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which might allow remote attackers to authenticate as other users via a request, a similar issue to CVE-2014-0015 . (CVE-2016-0755)
    last seen 2019-02-21
    modified 2018-04-18
    plugin id 88664
    published 2016-02-10
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88664
    title Amazon Linux AMI : curl (ALAS-2016-652)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-201701-47.NASL
    description The remote host is affected by the vulnerability described in GLSA-201701-47 (cURL: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in cURL. Please review the CVE identifiers and bug reports referenced for details. Impact : Remote attackers could conduct a Man-in-the-Middle attack to obtain sensitive information, cause a Denial of Service condition, or execute arbitrary code. Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2017-01-20
    plugin id 96644
    published 2017-01-20
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=96644
    title GLSA-201701-47 : cURL: Multiple vulnerabilities
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-3FA315A5DD.NASL
    description - match credentials when re-using a proxy connection (CVE-2016-0755) 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 2019-02-21
    modified 2016-10-18
    plugin id 89524
    published 2016-03-04
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=89524
    title Fedora 22 : curl-7.40.0-8.fc22 (2016-3fa315a5dd)
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2016-153.NASL
    description This update for curl fixes the following issues : - CVE-2016-0755: libcurl would reuse NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for this transfer (bsc#962983) The following tracked bugs only affect the test suite : - bsc#962996: Expired cookie in test 46 caused test failures
    last seen 2019-02-21
    modified 2016-10-13
    plugin id 88609
    published 2016-02-08
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88609
    title openSUSE Security Update : curl (openSUSE-2016-153)
  • NASL family SuSE Local Security Checks
    NASL id SUSE_SU-2016-0340-1.NASL
    description This update for curl fixes the following issues : - CVE-2016-0755: libcurl would reuse NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for this transfer (bsc#962983) The update package also includes non-security fixes. See advisory for details. Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-29
    plugin id 88621
    published 2016-02-08
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88621
    title SUSE SLED12 / SLES12 Security Update : curl (SUSE-SU-2016:0340-1)
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2016-152.NASL
    description This update for curl fixes the following issues : - CVE-2016-0755: libcurl would reuse NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for this transfer (bsc#962983) The following non-security bugs were fixed : - boo#936676: secure_getenv or __secure_getenv may not be detected correctly at build time The following tracked bugs only affect the test suite : - boo#962996: Expired cookie in test 46 caused test failures - boo#934333: Curl test suite was not run, is now enabled during build This update was imported from the SUSE:SLE-12:Update update project.
    last seen 2019-02-21
    modified 2016-10-13
    plugin id 88608
    published 2016-02-08
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88608
    title openSUSE Security Update : curl (openSUSE-2016-152)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-55137A3ADB.NASL
    description Update to 7.47.0 which fixes various CVE's 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 2019-02-21
    modified 2016-10-18
    plugin id 89546
    published 2016-03-04
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=89546
    title Fedora 23 : mingw-curl-7.47.0-1.fc23 (2016-55137a3adb)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-3455.NASL
    description Isaac Boukris discovered that cURL, an URL transfer library, reused NTLM-authenticated proxy connections without properly making sure that the connection was authenticated with the same credentials as set for the new transfer. This could lead to HTTP requests being sent over the connection authenticated as a different user.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 88424
    published 2016-01-28
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=88424
    title Debian DSA-3455-1 : curl - security update
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2016-57BEBAB3B6.NASL
    description - match credentials when re-using a proxy connection (CVE-2016-0755) 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 2019-02-21
    modified 2016-10-18
    plugin id 89548
    published 2016-03-04
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=89548
    title Fedora 23 : curl-7.43.0-5.fc23 (2016-57bebab3b6)
refmap via4
apple APPLE-SA-2016-09-20
bid 82307
confirm
debian DSA-3455
fedora
  • FEDORA-2016-3fa315a5dd
  • FEDORA-2016-55137a3adb
  • FEDORA-2016-57bebab3b6
  • FEDORA-2016-5a141de5d9
gentoo GLSA-201701-47
misc http://packetstormsecurity.com/files/135695/Slackware-Security-Advisory-curl-Updates.html
sectrack 1034882
slackware SSA:2016-039-01
suse
  • openSUSE-SU-2016:0360
  • openSUSE-SU-2016:0373
  • openSUSE-SU-2016:0376
ubuntu USN-2882-1
Last major update 05-12-2016 - 22:05
Published 29-01-2016 - 15:59
Last modified 16-10-2018 - 21:29
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