SB2023042839 - Code injection in Shadow
Published: April 28, 2023
Security Bulletin ID
SB2023042839
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2023-29383)
The vulnerability allows a local user to inject arbitrary code.
The vulnerability exists due to an input validation error when processing fields provided to the SUID program chfn (change finger). A local user can inject and execute arbitrary code or misrepresent existing files.
Remediation
Install update from vendor's website.
References
- https://github.com/shadow-maint/shadow/commit/e5905c4b84d4fb90aefcd96ee618411ebfac663d
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=31797
- https://github.com/shadow-maint/shadow/pull/687
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2023-29383-abusing-linux-chfn-to-misrepresent-etc-passwd/