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Program Features
Introduction

  • In this article, we tell the story of how we found a logical bug using the WinAFL fuzzer and exploited it in WinRAR to gain full control over a victim’s computer. The exploit works by just extracting an archive, and puts over 500 million users at risk.

  • One of the crashes produced by the fuzzer led us to an old, dated dynamic link library (dll) that was compiled back in 2006 without a protection mechanism (like ASLR, DEP, etc.) and is used by WinRAR.

  • We turned our focus and fuzzer to this “low hanging fruit” dll, and looked for a memory corruption bug that would hopefully lead to Remote Code Execution.

  • However, the fuzzer produced a test case with “weird” behavior. After researching this behavior, we found a logical bug: Absolute Path Traversal. From this point on it was simple to leverage this vulnerability to a remote code execution.

  • Perhaps it’s also worth mentioning that a substantial amount of money in various bug bounty programs is offered for these types of vulnerabilities.

See how it work

  • 🤡

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