CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:S/C:C/I:C/A:C
EPSS
Percentile
78.8%
Hendrik Weimer reports:
OpenVPN clients are a bit too generous when accepting
configuration options from a server. It is possible to transmit
environment variables to client-side shell scripts. There are some
filters in place to prevent obvious nonsense, however they don’t
catch the good old LD_PRELOAD trick. All we need is to put a file
onto the client under a known location (e.g. by returning a
specially crafted document upon web access) and we have a remote
root exploit. But since the attack may only come from authenticated
servers, this threat is greatly reduced.