Kerberos KDC krb5 TCP connection denial of service
| kerberos-kdc-krb5-tcp-connection-dos (21327) |  Low Risk |
Description:
The MIT Kerberos Key Distribution Center (KDC) is vulnerable to a denial of service. A remote attacker could send certain valid TCP requests to cause unallocated memory to be freed, which would cause the application to crash.
Platforms Affected:
- Canonical, Ubuntu 4.10
- Canonical, Ubuntu 5.04
- Conectiva, Linux 10
- Conectiva, Linux 9.0
- Debian, Debian Linux 3.0
- Debian, Debian Linux 3.1
- Gentoo, Linux
- MandrakeSoft, Mandrake Linux 10.0 AMD64
- MandrakeSoft, Mandrake Linux 10.0
- MandrakeSoft, Mandrake Linux 10.1 X86_64
- MandrakeSoft, Mandrake Linux 10.1
- MandrakeSoft, Mandrake Linux LE2005
- MandrakeSoft, Mandrake Linux LE2005 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 2.1 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 2.1
- MandrakeSoft, Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 3.0
- MandrakeSoft, Mandrake Multi Network Firewall 2.0
- MIT, Kerberos 5-1.3
- MIT, Kerberos 5-1.3.1
- MIT, Kerberos 5-1.3.2
- MIT, Kerberos 5-1.3.3
- MIT, Kerberos 5-1.3.4
- MIT, Kerberos 5-1.3.5
- MIT, Kerberos 5-1.3.6
- MIT, Kerberos 5-1.4
- MIT, Kerberos 5-1.4.1
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Enterprise Linux 2.1 WS
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 3 WS
- RedHat, Enterprise Linux 3 ES
- RedHat, Enterprise Linux 3 AS
- RedHat, Enterprise Linux 3 Desktop
- RedHat, Enterprise Linux 4 Desktop
- RedHat, Enterprise Linux 4 WS
- RedHat, Enterprise Linux 4 ES
- RedHat, Enterprise Linux 4 AS
- RedHat, Linux Advanced Workstation 2.1 Itanium
- Turbolinux, Turbolinux 10 Desktop
- Turbolinux, Turbolinux 10 F...
- Turbolinux, Turbolinux 10 Server
- Turbolinux, Turbolinux 8 Server
- Turbolinux, Turbolinux Home
- Turbolinux, Turbolinux Appliance Server 1.0 Hosting Ed
- Turbolinux, Turbolinux Appliance Server 1.0 Workgroup Ed
Remedy:
Upgrade to the latest version of MIT Kerberos 5 (krb5-1.4.2 or later), when it becomes available from the MIT Kerberos Web site. See References.
— OR —
Apply the patch for this vulnerability, as listed in MIT krb5 Security Advisory 2005-002. See References.
As a workaround, disable the TCP support, as listed in MIT krb5 Security Advisory 2005-002. See References.
For Debian GNU/Linus 3.1 (Sarge):
Upgrade to the latest version of krb5 (1.3.6-2sarge2 or later), as listed in DSA-757-1. See References.
For Gentoo Linux:
Upgrade to the latest version of mit-krb5 (1.4.1-r1 or later), as listed in Gentoo Linux Security Announcement GLSA 200507-11. See References.
For Conectiva Linux 9.0 and 10.0:
Upgrade to the latest version of krb5 (1.4.2 or later) when it becomes available, as listed in Conectiva Linux Security Announcement CLSA-2005:993. See References.
For Red Hat Linux:
Refer to RHSA-2005:562-15 for patch, upgrade, or suggested workaround information. See References.
— OR —
Apply the patch for this vulnerability, as listed in MIT krb5 Security Advisory 2005-002. See References.
For Ubuntu Linux:
Refer to USN-224-1 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
Consequences:
Denial of Service
References:
- CIAC INFORMATION BULLETIN P-249, krb5 Security Update at http://www.ciac.org/ciac/bulletins/p-249.shtml.
- CIAC Information Bulletin P-276, Apple Security Update 2005-007 at http://www.ciac.org/ciac/bulletins/p-276.shtml.
- Conectiva Linux Security Announcement CLSA-2005:993, Fix for security vulnerabilities in Kerberos 5 at http://distro.conectiva.com/atualizacoes/index.php?id=a&anuncio=000993.
- MIT Kerberos Web site, MIT krb5 Security Advisory 2005-003 at http://web.mit.edu/kerberos/advisories/2005-003-patch_1.4.1.txt.
- MIT krb5 Security Advisory 2005-002, buffer overflow, heap corruption in KDC at http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-002-kdc.txt.
- MIT krb5 Security Advisory 2005-003, double-free in krb5_recvauth at http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-003-recvauth.txt.
- BID-14240: MIT Kerberos 5 Key Distribution Center Remote Denial of Service Vulnerability
- BID-14567: Apple Mac OS X Multiple Vulnerabilities
- CVE-2005-1174: MIT Kerberos 5 (krb5) 1.3 through 1.4.1 Key Distribution Center (KDC) allows remote attackers to cause a denial of service (application crash) via a certain valid TCP connection that causes a free of unallocated memory.
- DSA-757: krb5 -- buffer overflow
- GLSA-200507-11: MIT Kerberos 5: Multiple vulnerabilities
- MDKSA-2005:119: Updated krb5 packages fix multiple vulnerabilities
- RHSA-2005-562: krb5 security update
- RHSA-2005-567: krb5 security update
- SA16041: Kerberos V5 Multiple Vulnerabilities
- SA20364: IBM DCE Two Kerberos Vulnerabilities
- SECTRACK ID: 1014460: MIT krb5 KDC Buffer Overflow in `do_as_req` and `do_tgs_req` May Let Remote Users Execute Arbitrary Code
- SUSE-SR:2005:017: SUSE Security Summary Report
Reported:
Jul 12, 2005
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