CVE-2000-0389

Cygnus Network Security - Buffer Overflow

Title source: rule
STIX 2.1

Exploitation Summary

EIP tracks 3 public exploits for CVE-2000-0389. PoCs published by Jim Paris, duke.

AI-analyzed exploit summary This exploit targets a buffer overflow vulnerability in the 'ksu' utility of MIT Kerberos versions prior to 1.1.1. It uses shellcode to execute 'sh' and gain root access by overflowing the buffer with a carefully crafted payload.

Description

Buffer overflow in krb_rd_req function in Kerberos 4 and 5 allows remote attackers to gain root privileges.

Exploits (3)

exploitdb WORKING POC VERIFIED
by Jim Paris · clocallinux
https://www.exploit-db.com/exploits/19925

This exploit targets a buffer overflow vulnerability in the 'ksu' utility of MIT Kerberos versions prior to 1.1.1. It uses shellcode to execute 'sh' and gain root access by overflowing the buffer with a carefully crafted payload.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: MIT Kerberos ksu utility < 1.1.1
No auth needed
Prerequisites: MIT Kerberos version prior to 1.1.1 · Presence of 'sh' in the current directory
devstral-2 · analyzed Feb 16, 2026 Full analysis →
exploitdb WORKING POC VERIFIED
by duke · cremotebsd
https://www.exploit-db.com/exploits/19924

This exploit targets a buffer overflow vulnerability in the krb_rd_req() function of Kerberos 4 compatibility code in MIT Kerberos 5 and other implementations. It crafts a malicious packet to overflow the buffer and execute arbitrary shellcode, leading to remote code execution (RCE) with root privileges.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: MIT Kerberos 5 (1.0.x, 1.1, 1.1.1), MIT Kerberos 4 (patch level 10 and prior), Cygnus KerbNet, and Network Security (CNS)
No auth needed
Prerequisites: Target system must have a vulnerable Kerberos implementation · The file /etc/kerberosIV/krb.conf must exist on the target · Network access to the target service (e.g., klogin, telnetd, ftpd)
devstral-2 · analyzed Feb 16, 2026 Full analysis →
exploitdb WORKING POC VERIFIED
by Jim Paris · cremotelinux
https://www.exploit-db.com/exploits/19926

This exploit targets a buffer overflow vulnerability in the krb_rd_req() function of MIT Kerberos 5 (versions 1.0.x, 1.1, 1.1.1) and Kerberos 4 (patch level 10 and prior). It leverages a stack-based overflow in krshd to execute arbitrary shellcode, potentially granting root access.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Racy
Target: MIT Kerberos 5 (1.0.x, 1.1, 1.1.1) and Kerberos 4 (patch level 10 and prior)
No auth needed
Prerequisites: Network access to vulnerable krshd service (port 544) · Knowledge of target system architecture and memory layout
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory vendor-advisory x_refsource_freebsd
http://archives.neohapsis.com/archives/freebsd/2000-05/0295.html
Vendor Advisory vendor-advisory x_refsource_redhat
http://www.redhat.com/support/errata/RHSA-2000-025.html
Third Party Advisory, US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-2000-06.html
Third Party Advisory mailing-list x_refsource_bugtraq
http://archives.neohapsis.com/archives/bugtraq/2000-05/0184.html
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/1220

Scores

EPSS 0.1650
EPSS Percentile 96.6%

Details

Status published
Products (6)
cygnus/cygnus_network_security 4.0
cygnus/kerbnet 5.0
mit/kerberos 4.0
mit/kerberos_5 1.0
mit/kerberos_5 1.1.1
redhat/linux 6.2 (3 CPE variants)
Published May 16, 2000
Tracked Since Feb 18, 2026