Proxytunnel is vulnerable to a format string vulnerability, potentially allowing a remote server to execute arbitrary code with the rights of the Proxytunnel process.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| net-misc/proxytunnel | * | < 1.2.3 | >= 1.2.3 |
Proxytunnel is a program that tunnels connections to a remote server through a standard HTTPS proxy.
Florian Schilhabel of the Gentoo Linux Security Audit project found a format string vulnerability in Proxytunnel. When the program is started in daemon mode (-a [port]), it improperly logs invalid proxy answers to syslog.
A malicious remote server could send specially-crafted invalid answers to exploit the format string vulnerability, potentially allowing the execution of arbitrary code on the tunnelling host with the rights of the Proxytunnel process.
You can mitigate the issue by only allowing connections to trusted remote servers.
All Proxytunnel users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/proxytunnel-1.2.3"