Web servers are vulnerable to a large class of attacks which can
\nallow a network attacker to steal sensitive web content. In this
\nwork, we investigate the feasibility of a web server architecture,
\nwherein the vulnerable server VM runs on a trusted cloud. All sensitive
\nweb content is made available to the vulnerable server VM in
\nencrypted form, thereby limiting the effectiveness of data-stealing
\nattacks through server VM compromise.
\nIn this context, the main challenge is to allow the legitimate functionality
\nof the untrusted server VM to work. As a step towards
\nthis goal, we develop a tool called AUTOCRYPT, which transforms
\na subset of existing C functionality in the web stack to operate on
\nencrypted sensitive content. We show that such a transformation
\nis feasible for several standard Unix utilities available in a typical
\nLAMP stack, with no developer effort. Key to achieving this expressiveness
\nover encrypted data, is our scheme to combine and
\nconvert between partially-homomorphic encryption (PHE) schemes
\nusing a small TCB in the trusted cloud hypervisor. We show
\nthat x86 code transformed with AUTOCRYPT achieves performance
\nthat is significantly better than its alternatives (downloading to a
\ntrusted client, or using fully-homomorphic encryption).<\/p>\n","protected":false},"excerpt":{"rendered":"
Web servers are vulnerable to a large class of attacks which can allow a network attacker to steal sensitive web content. In this work, we investigate the feasibility of a web server architecture, wherein the vulnerable server VM runs on a trusted cloud. 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