CVE-2023-29383 Information disclosure in n/a

What is CVE-2023-29383?

CVE-2023-29383 is a low-severity vulnerability in n/a, published on 14 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-74, CWE-125

Which versions are affected by CVE-2023-29383?

It affects 1 product.

Products include Shadow Project Shadow.

How do I fix CVE-2023-29383?

Apply the vendor's patch.

Is CVE-2023-29383 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-29383 exists.

Other vulnerabilities in n/a

• CVE-2019-19882 Privilege escalation in n/a High 7.8
• CVE-2016-6252 Integer overflow in n/a High 7.8
• CVE-2018-7169 Privilege escalation in n/a Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-26247, BELL-CVE-2023-29383, DEBIAN-CVE-2023-29383, ECHO-9410-1b2d-191e, GHSA-p9w4-8hh8-crcx, OESA-2023-1258 and 9 more.