Bug 2126045 (CVE-2022-39028) - CVE-2022-39028 krb5-appl: NULL pointer dereference
Summary: CVE-2022-39028 krb5-appl: NULL pointer dereference
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2022-39028
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 2123838
TreeView+ depends on / blocked
 
Reported: 2022-09-12 08:55 UTC by Sandipan Roy
Modified: 2022-11-25 11:24 UTC (History)
3 users (show)

Fixed In Version:
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Doc Text:
A flaw was found in MIT krb5-appl, where it has a NULL pointer dereference via 0xff 0xf7 or 0xff 0xf8. The telnetd application would crash in a typical installation, 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.
Clone Of:
Environment:
Last Closed: 2022-11-25 11:24:19 UTC
Embargoed:

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Description Sandipan Roy 2022-09-12 08:55:50 UTC 
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.

https://lists.gnu.org/archive/html/bug-inetutils/2022-08/msg00002.html
https://git.hadrons.org/cgit/debian/pkgs/inetutils.git/commit/?id=113da8021710d871c7dd72d2a4d5615d42d64289
https://pierrekim.github.io/blog/2022-08-24-2-byte-dos-freebsd-netbsd-telnetd-netkit-telnetd-inetutils-telnetd-kerberos-telnetd.html
Comment 3 Product Security DevOps Team 2022-11-25 11:24:17 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-39028
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