CVE-2022-39028

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.

USN-6304-1 — inetutils vulnerabilities

Affected: Ubuntu:20.04:LTS: inetutils, Ubuntu:22.04:LTS: inetutils

It was discovered that telnetd in GNU Inetutils incorrectly handled certain inputs. An attacker could possibly use this issue to cause a crash. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS (CVE-2022-39028)

It was discovered that Inetutils incorrectly handled certain inputs. An attacker could possibly use this issue to expose sensitive information, or execute arbitrary code. (CVE-2023-40303)

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CVE-2022-39028

USN-6304-1 — inetutils vulnerabilities