CVE-1999-1321: Buffer Overflow
Buffer overflow in ssh 1.2.26 client with Kerberos V enabled could allow remote attackers to cause a denial of service or execute arbitrary commands via a long DNS hostname that is not properly handled during TGT ticket passing.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Remove
Remove
ssh 1.2.26 clientfrom your environment.Uninstall or replace the vulnerable SSH 1.2.26 client if Kerberos V cannot be disabled or other mitigations are not feasible.
- Configuration
Disable Kerberos V support in the SSH client (or rebuild SSH without Kerberos V support) to prevent processing of long DNS hostnames during TGT ticket passing.
ssh 1.2.26 client Kerberos V = disabled - Compensating control
Restrict access to the vulnerable SSH client until a fix is available — e.g., limit inbound SSH to trusted IPs/networks using firewall rules or ACLs.
Event History
Frequently Asked Questions
What is the severity of CVE-1999-1321?
CVE-1999-1321 is classified as a high-severity vulnerability due to its potential to allow remote code execution and denial of service.
How do I fix CVE-1999-1321?
To fix CVE-1999-1321, upgrade the ssh client to a version that is not vulnerable, ideally a version released after 1.2.26.
What systems are affected by CVE-1999-1321?
CVE-1999-1321 affects the ssh 1.2.26 client specifically when used with MIT Kerberos V.
What are the potential impacts of CVE-1999-1321?
The potential impacts of CVE-1999-1321 include remote execution of arbitrary commands and denial of service.
Is there a workaround for CVE-1999-1321?
A temporary workaround for CVE-1999-1321 could involve limiting DNS hostname length, although updating the software is recommended.