Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Inetutils | <= 2.3 |
| Mit | Kerberos 5 | <= 1.0.3 |
| Debian | Debian Linux | 10.0 |
| Netkit-Telnet Project | Netkit-Telnet | <= 0.17 |
Related Weaknesses (CWE)
References
- https://git.hadrons.org/cgit/debian/pkgs/inetutils.git/commit/?id=113da8021710d8Mailing ListPatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00033.htmlMailing ListThird Party Advisory
- https://lists.gnu.org/archive/html/bug-inetutils/2022-08/msg00002.htmlMailing ListVendor Advisory
- https://pierrekim.github.io/blog/2022-08-24-2-byte-dos-freebsd-netbsd-telnetd-neExploitPatchThird Party Advisory
- https://git.hadrons.org/cgit/debian/pkgs/inetutils.git/commit/?id=113da8021710d8Mailing ListPatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00033.htmlMailing ListThird Party Advisory
- https://lists.gnu.org/archive/html/bug-inetutils/2022-08/msg00002.htmlMailing ListVendor Advisory
- https://pierrekim.github.io/blog/2022-08-24-2-byte-dos-freebsd-netbsd-telnetd-neExploitPatchThird Party Advisory
FAQ
What is CVE-2022-39028?
CVE-2022-39028 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 wo...
How severe is CVE-2022-39028?
CVE-2022-39028 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-39028?
Check the references section above for vendor advisories and patch information. Affected products include: Gnu Inetutils, Mit Kerberos 5, Debian Debian Linux, Netkit-Telnet Project Netkit-Telnet.