GNU inetutils vulnerabilities

telnetd in GNU inetutils through 2.7 allows privilege escalation by abusing systemd service credentials support added to the login(1) implementation of util-linux in release 2.40. The issue relates to client control over the CREDENTIALS_DIRECTORY environment variable and requires an unprivileged local user to create a login.noauth file.

telnetd in GNU inetutils through 2.7 allows an out-of-bounds write in the LINEMODE SLC (Set Local Characters) suboption handler because add_slc does not check whether the buffer is full.

A vulnerability in telnet in GNU inetutils through version 2.7 allows servers to read arbitrary environment variables from clients via the NEW_ENVIRON SEND USERVAR command.

GNU inetutils before 2.5 may allow privilege escalation due to unchecked return values of set*id() family functions in ftpd, rcp, rlogin, rsh, rshd, and uucpd.