NetworkManager-l2tp through 1.52.4, fixed in 1.52.6, contains an improper input validation vulnerability that allows local users with VPN connection creation permissions to inject arbitrary pppd directives by supplying mru or mtu property values containing trailing non-numeric content after a valid integer. Attackers can exploit the verbatim write of unvalidated strings into the pppd options file via write_config_option() to inject the plugin directive, causing the privileged pppd process to load an attacker-controlled shared object and achieve arbitrary code execution as root.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
nm-l2tp:networkmanager-l2tp
References 3
https://github.com/nm-l2tp/NetworkManager-l2tp/security/advisories/GHSA-rp84-8h…
GitHub Security Advisory (GHSA-rp84-8h2r-5xc3)
https://github.com/nm-l2tp/NetworkManager-l2tp/commit/64879ce0ad866f7c9a45babe4…
Patch Commit
https://www.vulncheck.com/advisories/networkmanager-l2tp-privilege-escalation-v…
NVD