Fixed
Created: Apr 16, 2023
Updated: May 27, 2023
Resolved Date: May 27, 2023
Found In Version: 10.21.20.1
Fix Version: 10.21.20.18
Severity: Standard
Applicable for: Wind River Linux LTS 21
Component/s: Userspace
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.
CREATE(Triage):(User=admin) CVE-2023-29383 (https://nvd.nist.gov/vuln/detail/CVE-2023-29383)
