Debian DLA-4130-1 Urgent: Shadow Login Tools Vulnerability Fix Released

CVE-2023-4641

When asking for a new password, shadow-utils asks the password
twice. If the password fails on the second attempt, shadow-utils
fails in cleaning the buffer used to store the first entry. This
may allow an attacker with enough access to retrieve the password
from the memory.

CVE-2023-29383

It is possible to inject control characters into fields provided
to the SUID program chfn (change finger). Although it is not
possible to exploit this directly (e.g., adding a new user fails
because \n is in the block list), it is possible to misrepresent
the /etc/passwd file when viewed.

For Debian 11 bullseye, these problems have been fixed in version
1:4.8.1-1+deb11u1.

We recommend that you upgrade your shadow packages.

For the detailed security status of shadow please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/shadow

Further information about Debian LTS security advisories, how to apply