Untrusted search path vulnerability in ProxyChains-NG before 4.9 allows local users to gain privileges via a Trojan horse libproxychains4.so library in the current working directory, which is referenced in the LD_PRELOAD path.
https://github.com/rofl0r/proxychains-ng/issues/60
https://github.com/rofl0r/proxychains-ng/blob/v4.9/README#L56
https://bugzilla.redhat.com/show_bug.cgi?id=1147013