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- Snyk ID SNYK-DEBIAN11-SHADOW-5423922
- published 15 Apr 2023
- disclosed 14 Apr 2023
How to fix?
There is no fixed version for
Note: Versions mentioned in the description apply only to the upstream
shadow package and not the
shadow package as distributed by
How to fix? for
Debian:11 relevant fixed versions and status.
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.