CVE-2022-39028

Published: 30 August 2022

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.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
inetutils Launchpad, Ubuntu, Debian	bionic	Needs triage
	focal	Released (2:1.9.4-11ubuntu0.2)
	jammy	Released (2:2.2-2ubuntu0.1)
	kinetic	Not vulnerable (2:2.3-5)
	lunar	Not vulnerable (2:2.3-5)
	mantic	Not vulnerable (2:2.3-5)
	trusty	Needs triage
	upstream	Released (2:2.3-5)
	xenial	Needs triage

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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