I am reaching out in the hopes of getting assistance with a potential zero-day Remote Code Execution (RCE) vulnerability that I am investigating on an Ubuntu-based OpenVPN system.
I've conducted preliminary research and tested various common vectors, including configuration issues, script injection possibilities, and management interface exposures, but so far I have not identified any clear RCE entry points. Given that this may involve an unknown vulnerability, I would greatly appreciate any guidance or suggestions you could provide to help with further investigation. Here's an outline of my approach so far: 1. *Version Check and Patch Review*: I've reviewed the OpenVPN version and checked it against known vulnerabilities to confirm that no publicly documented RCE vulnerabilities apply. 2. *Configuration and Script Review*: I examined the OpenVPN configuration for potential script injection points, especially within client-connect and client-disconnect directives. However, I haven't observed any exploitable behavior yet. 3. *Management Interface*: I verified that the management interface is securely configured to bind only to localhost, ruling out any obvious remote access risks. 4. *Fuzzing and Input Validation*: I've conducted input validation tests and fuzzed OpenVPN’s inputs to check for memory corruption or unexpected behaviors, yet no actionable results have surfaced. 5. *Exploration of Custom Scripts*: I inspected any custom scripts triggered by OpenVPN for unsafe operations or unsanitized inputs, without success in identifying potential injection points. 6. *Logs and Monitoring*: I’ve been carefully analyzing OpenVPN logs, including /var/log/openvpn.log and system logs, for any unusual activity that could indicate a vulnerability, but so far nothing indicative of RCE has been detected. If the team has any specific recommendations or could provide insight into any lesser-known configurations or common mistakes that may open up RCE risks, I would be grateful for any assistance. Additionally, if there are recent developments or ongoing work related to RCE prevention in OpenVPN that I might not be aware of, that information would also be invaluable. Thank you very much for any help you can offer in this matter. בתאריך יום ד׳, 13 בנוב׳ 2024 ב-14:54 מאת Gert Doering < g...@greenie.muc.de>: > Hi, > > On Wed, Nov 13, 2024 at 02:15:58PM +0200, ?????? ???????? wrote: > > I am finding rce vulnerabilities on ubuntu based openvpn > > please elaborate. > > gert > -- > "If was one thing all people took for granted, was conviction that if you > feed honest figures into a computer, honest figures come out. Never > doubted > it myself till I met a computer with a sense of humor." > Robert A. Heinlein, The Moon is a Harsh > Mistress > > Gert Doering - Munich, Germany > g...@greenie.muc.de > -- <https://netanel.ml>
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