update: shadow

[vbatts]

Name: shadow
CVEs: CVE-2023-29383
CVSSs: 3.3
Action Needed: update to >= sys-apps/shadow-4.13-r4

Summary:

• CVE-2023-29383: In Shadow 4.13, 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. Use of \r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that "cat /etc/passwd" shows a rogue user account.
  • https://bugs.gentoo.org/904518
• possible password leak during passwd(1) change
  • https://bugs.gentoo.org/908613

refmap.gentoo: