ID CVE-2012-4545
Summary The http_negotiate_create_context function in protocol/http/http_negotiate.c in ELinks 0.12 before 0.12pre6, when using HTTP Negotiate or GSS-Negotiate authentication, delegates user credentials through GSSAPI, which allows remote servers to authenticate as the client via the delegated credentials.
References
Vulnerable Configurations
  • Elinks 0.12pre1
    cpe:2.3:a:elinks:elinks:0.12:pre1
  • Elinks 0.12pre2
    cpe:2.3:a:elinks:elinks:0.12:pre2
  • Elinks 0.12pre3
    cpe:2.3:a:elinks:elinks:0.12:pre3
  • Elinks 0.12pre4
    cpe:2.3:a:elinks:elinks:0.12:pre4
  • Elinks 0.12pre5
    cpe:2.3:a:elinks:elinks:0.12:pre5
CVSS
Base: 5.1 (as of 03-01-2013 - 09:57)
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 HIGH NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL PARTIAL PARTIAL
nessus via4
  • NASL family Oracle Linux Local Security Checks
    NASL id ORACLELINUX_ELSA-2013-0250.NASL
    description From Red Hat Security Advisory 2013:0250 : An updated elinks package that fixes one security issue is now available for Red Hat Enterprise Linux 5 and 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. ELinks is a text-based web browser. ELinks does not display any images, but it does support frames, tables, and most other HTML tags. It was found that ELinks performed client credentials delegation during the client-to-server GSS security mechanisms negotiation. A rogue server could use this flaw to obtain the client's credentials and impersonate that client to other servers that are using GSSAPI. (CVE-2012-4545) This issue was discovered by Marko Myllynen of Red Hat. All ELinks users are advised to upgrade to this updated package, which contains a backported patch to resolve the issue.
    last seen 2019-02-21
    modified 2018-07-18
    plugin id 68729
    published 2013-07-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=68729
    title Oracle Linux 5 / 6 : elinks (ELSA-2013-0250)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2013-0207.NASL
    description - do not delegate GSSAPI credentials (CVE-2012-4545) 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 2015-10-19
    plugin id 63515
    published 2013-01-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=63515
    title Fedora 18 : elinks-0.12-0.32.pre5.fc18 (2013-0207)
  • NASL family Scientific Linux Local Security Checks
    NASL id SL_20130211_ELINKS_ON_SL5_X.NASL
    description It was found that ELinks performed client credentials delegation during the client-to-server GSS security mechanisms negotiation. A rogue server could use this flaw to obtain the client's credentials and impersonate that client to other servers that are using GSSAPI. (CVE-2012-4545)
    last seen 2019-02-21
    modified 2018-12-31
    plugin id 64566
    published 2013-02-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=64566
    title Scientific Linux Security Update : elinks on SL5.x, SL6.x i386/x86_64
  • NASL family Mandriva Local Security Checks
    NASL id MANDRIVA_MDVSA-2013-075.NASL
    description Updated elinks package fixes security vulnerability : Marko Myllynen discovered that ELinks, a powerful text-mode browser, incorrectly delegates user credentials during GSS-Negotiate (CVE-2012-4545).
    last seen 2019-02-21
    modified 2018-07-19
    plugin id 66089
    published 2013-04-20
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=66089
    title Mandriva Linux Security Advisory : elinks (MDVSA-2013:075)
  • NASL family CentOS Local Security Checks
    NASL id CENTOS_RHSA-2013-0250.NASL
    description An updated elinks package that fixes one security issue is now available for Red Hat Enterprise Linux 5 and 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. ELinks is a text-based web browser. ELinks does not display any images, but it does support frames, tables, and most other HTML tags. It was found that ELinks performed client credentials delegation during the client-to-server GSS security mechanisms negotiation. A rogue server could use this flaw to obtain the client's credentials and impersonate that client to other servers that are using GSSAPI. (CVE-2012-4545) This issue was discovered by Marko Myllynen of Red Hat. All ELinks users are advised to upgrade to this updated package, which contains a backported patch to resolve the issue.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 64562
    published 2013-02-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=64562
    title CentOS 5 / 6 : elinks (CESA-2013:0250)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-2592.NASL
    description Marko Myllynen discovered that ELinks, a powerful text-mode browser, incorrectly delegates user credentials during GSS-Negotiate.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 63342
    published 2012-12-28
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=63342
    title Debian DSA-2592-1 : elinks - programming error
  • NASL family Red Hat Local Security Checks
    NASL id REDHAT-RHSA-2013-0250.NASL
    description An updated elinks package that fixes one security issue is now available for Red Hat Enterprise Linux 5 and 6. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. ELinks is a text-based web browser. ELinks does not display any images, but it does support frames, tables, and most other HTML tags. It was found that ELinks performed client credentials delegation during the client-to-server GSS security mechanisms negotiation. A rogue server could use this flaw to obtain the client's credentials and impersonate that client to other servers that are using GSSAPI. (CVE-2012-4545) This issue was discovered by Marko Myllynen of Red Hat. All ELinks users are advised to upgrade to this updated package, which contains a backported patch to resolve the issue.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 64565
    published 2013-02-12
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=64565
    title RHEL 5 / 6 : elinks (RHSA-2013:0250)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2013-0265.NASL
    description - do not delegate GSSAPI credentials (CVE-2012-4545) 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 2015-10-19
    plugin id 63516
    published 2013-01-14
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=63516
    title Fedora 17 : elinks-0.12-0.29.pre5.fc17 (2013-0265)
redhat via4
advisories
bugzilla
id 864566
title CVE-2012-4545 elinks: Improper delegation of client credentials during GSS negotiation
oval
OR
  • AND
    • comment elinks is earlier than 0:0.12-0.21.pre5.el6_3
      oval oval:com.redhat.rhsa:tst:20130250005
    • comment elinks is signed with Red Hat redhatrelease2 key
      oval oval:com.redhat.rhsa:tst:20130250006
    • OR
      • comment Red Hat Enterprise Linux 6 Client is installed
        oval oval:com.redhat.rhsa:tst:20100842001
      • comment Red Hat Enterprise Linux 6 Server is installed
        oval oval:com.redhat.rhsa:tst:20100842002
      • comment Red Hat Enterprise Linux 6 Workstation is installed
        oval oval:com.redhat.rhsa:tst:20100842003
      • comment Red Hat Enterprise Linux 6 ComputeNode is installed
        oval oval:com.redhat.rhsa:tst:20100842004
  • AND
    • comment Red Hat Enterprise Linux 5 is installed
      oval oval:com.redhat.rhsa:tst:20070055001
    • comment elinks is earlier than 0:0.11.1-8.el5_9
      oval oval:com.redhat.rhsa:tst:20130250008
    • comment elinks is signed with Red Hat redhatrelease key
      oval oval:com.redhat.rhsa:tst:20070933006
rhsa
id RHSA-2013:0250
released 2013-02-11
severity Moderate
title RHSA-2013:0250: elinks security update (Moderate)
rpms
  • elinks-0:0.12-0.21.pre5.el6_3
  • elinks-0:0.11.1-8.el5_9
refmap via4
bid 57065
confirm
debian DSA-2592
mandriva MDVSA-2013:075
secunia 51569
xf elinks-httpnegotiate-security-bypass(80882)
Last major update 05-12-2013 - 00:18
Published 02-01-2013 - 20:55
Last modified 28-08-2017 - 21:32
Back to Top