MIT Kerberos KDC negative length denial of service
| kerberos-kdc-neglength-dos (11190) |  High Risk |
Description:
The MIT Kerberos Key Distribution Center (KDC) is vulnerable to a denial of service, caused by an integer signedness error. By sending malformed packets to the system that would cause a negative amount of storage to be allocated, a remote attacker could cause the KDC to crash.
Platforms Affected:
- Conectiva, Linux 8.0
- MandrakeSoft, Mandrake Linux 8.2
- MandrakeSoft, Mandrake Linux 8.2 PPC
- MandrakeSoft, Mandrake Linux 9.0
- MandrakeSoft, Mandrake Linux 9.1
- MandrakeSoft, Mandrake Linux 9.1 PPC
- MandrakeSoft, Mandrake Linux Corporate Server 2.1
- MandrakeSoft, Mandrake Linux Corporate Server 2.1 X86_64
- MandrakeSoft, Mandrake Multi Network Firewall 8.2
- MIT, Kerberos 5-1.2.1
- MIT, Kerberos 5-1.2.2
- MIT, Kerberos 5-1.2.3
- MIT, Kerberos 5-1.2.4
- RedHat, Enterprise Linux 2.1 WS
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Linux 6.2
- RedHat, Linux 7
- RedHat, Linux 7.1
- RedHat, Linux 7.1 for iSeries
- RedHat, Linux 7.1 for pSeries
- RedHat, Linux 7.2
- RedHat, Linux 7.3
- RedHat, Linux 8.0
- RedHat, Linux Advanced Workstation 2.1 Itanium
Remedy:
Upgrade to the latest version of MIT Kerberos 5 (krb5-1.2.7 or later), available from the MIT Kerberos Web site. See References.
For Conectiva Linux 8.0:
Upgrade to the latest version of krb5 (1.2.8-1U80_1cl or later), as listed in Conectiva Linux Security Announcement CLSA-2003:639. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Gain Access
References:
- CIAC Information Bulletin N-037, Multiple Vulnerabilities in Old Releases of MIT Kerberos at http://www.ciac.org/ciac/bulletins/n-037.shtml.
- Conectiva Linux Security Announcement CLSA-2003:639, krb5 at http://distro.conectiva.com/atualizacoes/?id=a&anuncio=000639.
- MIT Kerberos Web site, Kerberos: The Network Authentication Protocol at http://web.mit.edu/kerberos/www/.
- MIT krb5 Security Advisory 2003-001, Multiple vulnerabilities in old releases of MIT Kerberos at http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-001-multiple.txt.
- BID-6713: MIT Kerberos ASN.1 Decoder Heap Corruption Vulnerability
- CVE-2002-0036: Integer signedness error in MIT Kerberos V5 ASN.1 decoder before krb5 1.2.5 allows remote attackers to cause a denial of service via a large unsigned data element length, which is later used as a negative value.
- MDKSA-2003:043: Updated krb5 packages fix multiple vulnerabilities
- MDKSA-2003:043-1: Updated krb5 packages fix multiple vulnerabilities
- OSVDB ID: 4896: Kerberos 5 ASN.1 Decoder Heap Corruption DoS
- RHSA-2003-051: Updated kerberos packages fix various vulnerabilities
- RHSA-2003-052: krb5 security update
- RHSA-2003-168: Updated kerberos packages fix various vulnerabilities
- US-CERT VU#587579: MIT Kerberos V5 ASN.1 decoder fails to perform bounds checking on data element length fields
Reported:
Jan 28, 2003
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