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.

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.

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.

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.

The remote NewStart CGSL host, running version MAIN 6.06, has krb5 packages installed that are affected by multiple vulnerabilities:

  - plugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles     Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial     of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related     to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use     cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin     code that is specific to Red Hat. (CVE-2017-15088)

  - The process_chpw_request function in schpw.c in the password-changing functionality in kadmind in MIT     Kerberos 5 (aka krb5) 1.7 through 1.9 frees an invalid pointer, which allows remote attackers to execute     arbitrary code or cause a denial of service (daemon crash) via a crafted request that triggers an error     condition. (CVE-2011-0285)

  - schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly     validate UDP packets before sending responses, which allows remote attackers to cause a denial of service     (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by     krb_pingpong.nasl, a related issue to CVE-1999-0103. (CVE-2002-2443)

  - The (1) ftpd and (2) ksu programs in (a) MIT Kerberos 5 (krb5) up to 1.5, and 1.4.x before 1.4.4, and (b)     Heimdal 0.7.2 and earlier, do not check return codes for setuid calls, which might allow local users to     gain privileges by causing setuid to fail to drop privileges. NOTE: as of 20060808, it is not known     whether an exploitable attack scenario exists for these issues. (CVE-2006-3084)

  - The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration     daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in     freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute     arbitrary code via unspecified vectors. (CVE-2006-6143)

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

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2012-836:04 advisory.

    Kerberos V5 is a trusted-third-party network authentication system, which can improve your network's     security by eliminating the insecure practice of cleartext passwords.
    Security issues fixed with this release:
     CVE-2012-1013     The check_1_6_dummy function in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka krb5)     1.8.x, 1.9.x, and 1.10.x before 1.10.2 allows remote authenticated administrators to cause a denial of     service (NULL pointer dereference and daemon crash) via a KRB5_KDB_DISALLOW_ALL_TIX create request that     lacks a password.
     CVE-2012-1015     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.

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

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

Several potential codeexecution flaws were fixed in krb5.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
61379	Ubuntu 10.04 LTS / 11.04 / 11.10 / 12.04 LTS : krb5 vulnerabilities (USN-1520-1)	Nessus	Ubuntu Local Security Checks	2012/8/1	2019/9/19	high
61425	Fedora 17 : krb5-1.10.2-6.fc17 (2012-11388)	Nessus	Fedora Local Security Checks	2012/8/6	2021/1/11	high
66056	Mandriva Linux Security Advisory : krb5 (MDVSA-2013:042)	Nessus	Mandriva Local Security Checks	2013/4/20	2021/1/6	high
67093	CentOS 6 : krb5 (CESA-2012:1131)	Nessus	CentOS Local Security Checks	2013/6/29	2021/1/4	high
266225	NewStart CGSL MAIN 6.06 : krb5 Multiple Vulnerabilities (NS-SA-2025-0215)	Nessus	NewStart CGSL Local Security Checks	2025/9/30	2025/10/1	critical
61377	RHEL 6 : krb5 (RHSA-2012:1131)	Nessus	Red Hat Local Security Checks	2012/8/1	2021/1/14	high
283915	MiracleLinux 4 : krb5-1.9-33.AXS4.2 (AXSA:2012-836:04)	Nessus	Miracle Linux Local Security Checks	2026/1/14	2026/1/14	medium
74706	openSUSE Security Update : krb5 (openSUSE-SU-2012:0967-1)	Nessus	SuSE Local Security Checks	2014/6/13	2021/1/19	high

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