جزئیات آسیب‌پذیری

facil.io 0.7.5 through 0.7.6 contains a denial-of-service vulnerability in the HTTP/1.1 chunked transfer encoding parser that allows unauthenticated remote attackers to crash the server by sending a negative chunk size value. Attackers can send a single POST request with a Transfer-Encoding: chunked header containing a leading minus sign in the chunk size field, causing the parser in http1_parser.h to compute a large positive integer from the negated value, corrupting internal state and moving the read pointer into unmapped memory resulting in a fault.

• https://tpaidakis.com/writeups/facilio-parser-dos/ technical-descriptionexploit
• https://github.com/theopaid/Negative-Chunk-Size-Parsing-Causes-Memory-Corruption-in-facil.io-leading-to-Server-Crash technical-descriptionexploit
• https://www.vulncheck.com/advisories/facil-io-http-chunked-transfer-encoding-parser-crash-dos third-party-advisory