telnet is vulnerable to remote code execution. The vulnerability exists due to a lack of check on the boundary of Nextitem() Function. This vulnerability exists in the telnet-server
package, not in the telnet
client-side package.
access.redhat.com/errata/RHSA-2022:0011
access.redhat.com/security/updates/classification/#important
appgateresearch.blogspot.com/2020/02/bravestarr-fedora-31-netkit-telnetd_28.html
bugzilla.redhat.com/show_bug.cgi?id=1811673
github.com/krb5/krb5-appl/blob/d00cd671dfe945791b33d4f1f6a5c57ae1667ef8/telnet/telnetd/utility.c#L205-L216
lists.debian.org/debian-lts-announce/2020/05/msg00012.html
lists.debian.org/debian-lts-announce/2020/08/msg00038.html
lists.fedoraproject.org/archives/list/[email protected]/message/7FMTRRQTYKWZD2GMXX3GLZV46OLPCLVK/
lists.fedoraproject.org/archives/list/[email protected]/message/HLU6FL24BSQQEB2SJC26NLJ2MANQDA7M/
lists.fedoraproject.org/archives/list/[email protected]/message/K3VJ6V2Z3JRNJOBVHSOPMAC76PSSKG6A/
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-telnetd-EFJrEzPx
www.arista.com/en/support/advisories-notices/security-advisories/10702-security-advisory-48
www.oracle.com/security-alerts/cpuApr2021.html