The kdc_handle_protected_negotiation function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8.x, 1.9.x before 1.9.5, and 1.10.x before 1.10.3 attempts to calculate a checksum before verifying that the key type is appropriate for a checksum, which allows remote attackers to execute arbitrary code or cause a denial of service (uninitialized pointer free, heap memory corruption, and daemon crash) via a crafted AS-REQ request.

Several potential codeexecution flaws were fixed in krb5.

The remote host is affected by the vulnerability described in GLSA-201312-12 (MIT Kerberos 5: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in the Key Distribution       Center in MIT Kerberos 5. Please review the CVE identifiers referenced       below for details.
  Impact :

    A remote attacker could send a specially crafted request, possibly       resulting in execution of arbitrary code with the privileges of the       process or a Denial of Service condition. Additionally, a remote attacker       could impersonate a kadmind server and send a specially crafted packet to       the password change port, which can result in a ping-pong condition and a       Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC handled initial authentication requests (AS-REQ). A remote, unauthenticated attacker could use this flaw to crash the KDC via a specially crafted AS-REQ request. (CVE-2012-1015)

A NULL pointer dereference flaw was found in the MIT Kerberos administration daemon, kadmind. A Kerberos administrator who has the 'create' privilege could use this flaw to crash kadmind.
(CVE-2012-1013)

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2012-1131 advisory.

    - pull up the patch to correct a possible NULL pointer dereference in       kadmind (CVE-2012-1013, #827517)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Updated krb5 packages that fix two security issues are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third-party, the Key Distribution Center (KDC).

An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC handled initial authentication requests (AS-REQ). A remote, unauthenticated attacker could use this flaw to crash the KDC via a specially crafted AS-REQ request. (CVE-2012-1015)

A NULL pointer dereference flaw was found in the MIT Kerberos administration daemon, kadmind. A Kerberos administrator who has the 'create' privilege could use this flaw to crash kadmind.
(CVE-2012-1013)

Red Hat would like to thank the MIT Kerberos project for reporting CVE-2012-1015. Upstream acknowledges Emmanuel Bouillon (NCI Agency) as the original reporter of CVE-2012-1015.

All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the krb5kdc and kadmind daemons will be restarted automatically.

Multiple vulnerabilities has been discovered and corrected in krb5 :

Fix a kadmind denial of service issue (NULL pointer dereference), which could only be triggered by an administrator with the create privilege (CVE-2012-1013).

The MIT krb5 KDC (Key Distribution Center) daemon can free an uninitialized pointer while processing an unusual AS-REQ, corrupting the process heap and possibly causing the daemon to abnormally terminate. An attacker could use this vulnerability to execute malicious code, but exploiting frees of uninitialized pointers to execute code is believed to be difficult. It is possible that a legitimate client that is misconfigured in an unusual way could trigger this vulnerability (CVE-2012-1015).

It was reported that the KDC plugin for PKINIT could dereference a NULL pointer when a malformed packet caused processing to terminate early, which led to a crash of the KDC process. An attacker would require a valid PKINIT certificate or have observed a successful PKINIT authentication to execute a successful attack. In addition, an unauthenticated attacker could execute the attack of anonymouse PKINIT was enabled (CVE-2013-1415).

The updated packages have been patched to correct these issues.

A vulnerability has been discovered and corrected in krb5 :

The MIT krb5 KDC (Key Distribution Center) daemon can free an uninitialized pointer while processing an unusual AS-REQ, corrupting the process heap and possibly causing the daemon to abnormally terminate. An attacker could use this vulnerability to execute malicious code, but exploiting frees of uninitialized pointers to execute code is believed to be difficult. It is possible that a legitimate client that is misconfigured in an unusual way could trigger this vulnerability (CVE-2012-1015).

The updated packages have been patched to correct this issue.

This update updates the package from version 1.9.3 to version 1.9.4, mainly to pick up a fix for an interoperability problem with Windows Server 2008R2 read-only domain controllers, and incorporates the upstream fix for CVE-2012-1015, in which the KDC could be made to attempt to free an uninitialized pointer.

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.

This update incorporates the upstream fixes for CVE-2012-1014 and CVE-2012-1015, in which the KDC could be made to attempt to dereference or free an uninitialized pointer.

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.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third party, the Key Distribution Center (KDC).

An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC handled initial authentication requests (AS-REQ). A remote, unauthenticated attacker could use this flaw to crash the KDC via a specially crafted AS-REQ request. (CVE-2012-1015)

A NULL pointer dereference flaw was found in the MIT Kerberos administration daemon, kadmind. A Kerberos administrator who has the 'create' privilege could use this flaw to crash kadmind.
(CVE-2012-1013)

All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the krb5kdc and kadmind daemons will be restarted automatically.

Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center (KDC) daemon could free an uninitialized pointer when handling a malformed AS-REQ message. A remote unauthenticated attacker could use this to cause a denial of service or possibly execute arbitrary code.
(CVE-2012-1015)

Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center (KDC) daemon could dereference an uninitialized pointer while handling a malformed AS-REQ message. A remote unauthenticated attacker could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS. (CVE-2012-1014)

Simo Sorce discovered that the MIT krb5 Key Distribution Center (KDC) daemon could dereference a NULL pointer when handling a malformed TGS-REQ message. A remote authenticated attacker could use this to cause a denial of service. (CVE-2012-1013)

It was discovered that the kadmin protocol implementation in MIT krb5 did not properly restrict access to the SET_STRING and GET_STRINGS operations. A remote authenticated attacker could use this to expose or modify sensitive information. This issue only affected Ubuntu 12.04 LTS. (CVE-2012-1012).

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.

Emmanuel Bouillon from NCI Agency discovered multiple vulnerabilities in MIT Kerberos, a daemon implementing the network authentication protocol.

  - CVE-2012-1014     By sending specially crafted AS-REQ (Authentication     Service Request) to a KDC (Key Distribution Center), an     attacker could make it free an uninitialized pointer,     corrupting the heap. This can lead to process crash or     even arbitrary code execution.

  This CVE only affects testing (wheezy) and unstable (sid)   distributions.

  - CVE-2012-1015     By sending specially crafted AS-REQ to a KDC, an     attacker could make it dereference an uninitialized     pointer, leading to process crash or even arbitrary code     execution

In both cases, arbitrary code execution is believed to be difficult to achieve, but might not be impossible.

ID	Name	Product	Family	Severity
74706	openSUSE Security Update : krb5 (openSUSE-SU-2012:0967-1)	Nessus	SuSE Local Security Checks	high
71487	GLSA-201312-12 : MIT Kerberos 5: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
69604	Amazon Linux AMI : krb5 (ALAS-2012-114)	Nessus	Amazon Linux Local Security Checks	high
68589	Oracle Linux 6 : krb5 (ELSA-2012-1131)	Nessus	Oracle Linux Local Security Checks	high
67093	CentOS 6 : krb5 (CESA-2012:1131)	Nessus	CentOS Local Security Checks	high
66056	Mandriva Linux Security Advisory : krb5 (MDVSA-2013:042)	Nessus	Mandriva Local Security Checks	high
61970	Mandriva Linux Security Advisory : krb5 (MDVSA-2012:120)	Nessus	Mandriva Local Security Checks	high
61477	Fedora 16 : krb5-1.9.4-3.fc16 (2012-11370)	Nessus	Fedora Local Security Checks	high
61425	Fedora 17 : krb5-1.10.2-6.fc17 (2012-11388)	Nessus	Fedora Local Security Checks	high
61407	Scientific Linux Security Update : krb5 on SL6.x i386/x86_64 (20120731)	Nessus	Scientific Linux Local Security Checks	high
61379	Ubuntu 10.04 LTS / 11.04 / 11.10 / 12.04 LTS : krb5 vulnerabilities (USN-1520-1)	Nessus	Ubuntu Local Security Checks	high
61377	RHEL 6 : krb5 (RHSA-2012:1131)	Nessus	Red Hat Local Security Checks	high
61374	Debian DSA-2518-1 : krb5 - denial of service and remote code execution	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2012-1015

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