CVE-2002-2443: Input Validation
A flaw in certain programs that handle UDP traffic was discovered and assigned the name CVE-1999-0103 (that CVE specifically mentions echo and chargen as vulnerable). In 2002, a Nessus plugin was included [1] that reference this CVE name, but was for the kpasswd service. Until recently, this issue had not been reported upstream. This issue has since been reported upstream [2] and is now fixed [3].
If a malicious remote user were to spoof their IP address to that of another server running kadmind with the password change port (kpasswd, port 464), or to the target server's IP address itself), kpasswd will pass UDP packets to the spoofed address and reply each time. This can be used to consume bandwidth and CPU on the affected servers running kadmind.
This should be fixed in the for krb5-1.11.3 release.
[1] http://marc.info/?l=nessus&m=102418951803893&w=2 [2] http://krbdev.mit.edu/rt/Ticket/Display.html?id=7637 [3] https://github.com/krb5/krb5/commit/cf1a0c411b2668c57c41e9c4efd15ba17b6b322c
Other sources
schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly validate UDP packets before sending responses, which allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by krbpingpong.nasl, a related issue to CVE-1999-0103.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2002-2443?
CVE-2002-2443 is considered a moderate severity vulnerability that affects various implementations of UDP traffic handling.
How do I fix CVE-2002-2443?
To fix CVE-2002-2443, ensure that you update your vulnerable software packages to the latest versions that contain the security fixes.
Which software is affected by CVE-2002-2443?
CVE-2002-2443 affects several software, including MIT Kerberos 5, various versions of openSUSE, Fedora, Red Hat Enterprise Linux, and Debian.
Is CVE-2002-2443 exploitable remotely?
Yes, CVE-2002-2443 can be exploited remotely due to its impact on how UDP traffic is handled by affected software.
What can happen if CVE-2002-2443 is exploited?
Exploitation of CVE-2002-2443 may lead to denial of service or potentially allow an attacker to perform arbitrary code execution.