CVE-2023-29383
- Reference to the description:
- Description:
- 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.
- Last updated date:
- 02/06/2025
- Type:
- exploit
- Confidence:
- HIGH
- Date of publishing:
- 04/24/2023
- Type:
- exploit
- Confidence:
- HIGH
- Date of publishing:
- 04/24/2023
- Reference url to background
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797