CVE-2022-39028

Public Exploit

Description

telnetd in GNU Inetutils through 2.3, MIT krb5-appl through 1.0.3, and derivative works has a NULL pointer dereference via 0xff 0xf7 or 0xff 0xf8. In a typical installation, the telnetd application would crash but the telnet service would remain available through inetd. However, if the telnetd application has many crashes within a short time interval, the telnet service would become unavailable after inetd logs a "telnet/tcp server failing (looping), service terminated" error. NOTE: MIT krb5-appl is not supported upstream but is shipped by a few Linux distributions. The affected code was removed from the supported MIT Kerberos 5 (aka krb5) product many years ago, at version 1.8.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.27%
Vendor Advisory hadrons.org Vendor Advisory gnu.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://lists.gnu.org/archive/html/bug-inetutils/2022-08/msg00002.html mailing list vendor advisory
https://pierrekim.github.io/blog/2022-08-24-2-byte-dos-freebsd-netbsd-telnetd-netkit-telnetd-inetutils-telnetd-kerberos-telnetd.html exploit third party advisory patch
https://git.hadrons.org/cgit/debian/pkgs/inetutils.git/commit/?id=113da8021710d871c7dd72d2a4d5615d42d64289 mailing list patch vendor advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00033.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2022-39028?
CVE-2022-39028 has been scored as a high severity vulnerability.
How to fix CVE-2022-39028?
To fix CVE-2022-39028, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-39028 being actively exploited in the wild?
It is possible that CVE-2022-39028 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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