Post some code that people can evaluate. For starters, There's no reason why varnish ever has to run as root. It never listens on privileged ports, and the C compiler is never available over a network interface. You can ask varnish to reload a configuration and recompile it, but you'd have to have write access to the filesystem first. You an also only cause recompilation to occur if the admin interface is up and running, which can be easily disabled. Poul is probably correct. Any vulnerabilities in Varnish with regards to privilege escalation are configuration issues. -j On Mon, Mar 29, 2010 at 12:49 AM, Tim Brown <timb@xxxxxxxxxxxxxxxxxxxx> wrote: > Hi, > > I've identified a couple of security flaws affecting the Varnish reverse proxy > which may allow privilege escalation. These issues were reported by email to > the vendor but he feels that it is a configurational issue rather than a design > flaw. Whilst I can partially see his point in that the administrative > interface can be disabled, I'm not convinced that making a C compiler > available over a network interface without authentication is sound practice, > especially when the resultant compiled code can be made to run as root rather > trivially. > > Tim > -- > Tim Brown > <mailto:timb@xxxxxxxxxxxxxxxxxxxx> > <http://www.nth-dimension.org.uk/> > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/ >
