mport is the MidnightBSD Package Manager. Prior to 2.7.8, do_actual_install() in libmport/bundle_read_install_pkg.c used path-based lstat(), chown(), stat(), and chmod() operations while installing package files. A local attacker with write access to a target directory could replace a checked file with a symlink before privileged ownership or mode changes were applied, redirecting those changes to an attacker-selected path and compromising filesystem integrity or permissions.
This issue is fixed in version 2.7.8.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/MidnightBSD/mport/commit/4676ac05b1056b54a3d38d03ae8a478bf12…
security-advisories@github.com
https://github.com/MidnightBSD/mport/pull/150
security-advisories@github.com
https://github.com/MidnightBSD/mport/releases/tag/2.7.8
security-advisories@github.com
https://github.com/MidnightBSD/mport/security/advisories/GHSA-23g3-7fv3-3ccf
security-advisories@github.com