Title: GNU Zebra / Quagga Remote Denial of Service Vulnerability
Severity: HIGH
Description:
GNU Zebra is an open source implementation of TCP/IP routing software. It supports BGP-4, RIPv1, RIPv2 and OSPFv2 protocols. Quagga is a routing software suite which was derived from GNU Zebra.
A vulnerability has been reported to be present in the software that may allow a remote attacker to a cause a denial of service condition in the software. The issue is reported to occur if an attacker attempts to connect to the Zebra or Quagga telnet management port while a password is enabled.
The problem specifically occurs due to an invalid (typically NULL) pointer dereference. This occurs because the vty layer fails to verify whether a Telnet sub-negotation is currently in progress prior to handling an end negotiation marker (SE). This will likely occur if the SE is received at an unexpected time.
Successful exploitation of this issue may allow an attacker who passes a malformed Telnet command to the server, to cause the software to behave in an unstable manner leading to a crash or hang.
All versions of GNU Zebra are said to be vulnerable to this issue. All versions of Quagga prior to 0.96.4 are also vulnerable.
Affected Products:
- Conectiva Linux 9.0.0
- Conectiva Linux Enterprise Edition 1.0.0
- GNU Zebra 0.91.0 a
- GNU Zebra 0.92.0 a
- GNU Zebra 0.93.0 a
- GNU Zebra 0.93.0 b
- OpenPKG OpenPKG 1.2.0
- OpenPKG OpenPKG 1.3.0
- Quagga Quagga Routing Software Suite 0.96.2
- Quagga Quagga Routing Software Suite 0.96.3
- RedHat Advanced Workstation for the Itanium Processor 2.1.0 IA64
- RedHat Enterprise Linux AS 2.1
- RedHat Enterprise Linux AS 2.1 IA64
- RedHat Enterprise Linux AS 3
- RedHat Enterprise Linux ES 3
- RedHat Linux 7.3.0
- RedHat Linux 8.0.0
- RedHat Linux 9.0.0 i386
- RedHat Linux Advanced Work Station 2.1.0
- SGI ProPack 2.2.1
- SGI ProPack 2.3.0
- Sun Linux 5.0.7
References:
- Conectiva: CLSA-2003:789 zebra
- Debian: DSA-415-1
- Quagga: Quagga Software Suite Homepage
- RedHat: RHSA-2003:305-12 Updated zebra packages fix security vulnerabilities
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