CVEvulnerability

CVE-2023-29383

3.3 LOW Published 2023-04-14 Modified 2026-10-14 Official page ↗
Status
Modified
Published
2023-04-14
Last modified
2026-10-14
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.3 LOW — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-125, CWE-74

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.

Affected configurations

• shadow project shadow 4.13

Related

Weakness · CWE (2)

  • CWE-125 Out-of-bounds Read weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component weakness

References