Zebra telnet management service denial of service
| zebra-telnet-mngmt-dos (13758) |  Medium Risk |
Description:
Zebra is vulnerable to a denial of service. A remote attacker could connect to the Telnet management port and cause the service to crash, if a Zebra password has been enabled.
Note: Quagga is also affected by this vulnerability.
Consequences:
Denial of Service
Remedy:
For Red Hat Linux:
Upgrade to the latest zebra package, as listed below. Refer to RHSA-2003:307-09 for more information. See References.
Red Hat 7.2: 0.91a-8.7.2 or later
Red Hat 7.3: 0.92a-5.7.3 or later
Red Hat 8.0: 0.93a-5.8.0 or later
Red Hat 9: 0.93b-4.9 or later
For Conectiva Linux:
Upgrade to the latest zebra package, as listed below. Refer to Conectiva Linux Security Announcement CLSA-2003:786 for more information. See References.
Conectiva Linux 9: 0.93b-27301U90_1cl or later
For OpenPKG:
Upgrade to the latest zebra package, as listed below. Refer to OpenPKG Security Advisory OpenPKG-SA-2003.049 for more information. See References.
OpenPKG CURRENT: 0.93b-20031113 or later
OpenPKG 1.2: 0.93b-1.2.1 or later
OpenPKG 1.3: 0.93b-1.3.1 or later
For Debian GNU/Linux 3.0 (woody):
Upgrade to the latest zebra package (0.92a-5woody2 or later), as listed in DSA-415-1. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- BugTraq Mailing List, Fri Nov 14 2003 - 07:16:37 CST: Quagga remote vulnerability.
- Conectiva Linux Security Announcement CLSA-2003:786: zebra.
- BID-9029: GNU Zebra / Quagga Remote Denial of Service Vulnerability
- CVE-2003-0795: The vty layer in Quagga before 0.96.4, and Zebra 0.93b and earlier, does not verify that sub-negotiation is taking place when processing the SE marker, which allows remote attackers to cause a denial of service (crash) via a malformed telnet command to the telnet CLI port, which may trigger a null dereference.
- DSA-415: zebra -- denial of service
- OpenPKG-SA-2003.049: Zebra
- RHSA-2003-305: zebra security update
- RHSA-2003-307: Updated zebra packages fix security vulnerabilities
Platforms Affected:
- Conectiva Linux 9.0
- Debian Debian Linux 3.0
- GNU Zebra
- OpenPKG OpenPKG 1.2
- OpenPKG OpenPKG 1.3
- OpenPKG OpenPKG CURRENT
- Quagga Quagga prior to 0.96.4
- RedHat Enterprise Linux 2.1 AS
- RedHat Linux 7.2
- RedHat Linux 7.3
- RedHat Linux 8.0
- RedHat Linux 9.0
- RedHat Linux Advanced Workstation 2.1 Itanium
Reported:
Nov 13, 2003
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