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Files from Nicky Mouha

Email addressnicky at mouha.be
First Active2023-03-07
Last Active2023-03-07
A Vulnerability In Implementations of SHA-3, SHAKE, EdDSA, And Other NIST-Approved Algorithms
Posted Mar 7, 2023
Authored by Nicky Mouha, Christopher Celi | Site eprint.iacr.org

This paper describes a vulnerability in several implementations of the Secure Hash Algorithm 3 (SHA-3) that have been released by its designers. The vulnerability has been present since the final-round update of Keccak was submitted to the National Institute of Standards and Technology (NIST) SHA-3 hash function competition in January 2011, and is present in the eXtended Keccak Code Package (XKCP) of the Keccak team. It affects all software projects that have integrated this code, such as the scripting languages Python and PHP Hypertext Preprocessor (PHP). The vulnerability is a buffer overflow that allows attacker-controlled values to be eXclusive-ORed (XORed) into memory (without any restrictions on values to be XORed and even far beyond the location of the original buffer), thereby making many standard protection measures against buffer overflows (e.g., canary values) completely ineffective.

tags | paper, overflow, cryptography, php, python
advisories | CVE-2022-37454
SHA-256 | e5ce94c802fc96b96a37593074295283819a7abf859a04a1c1cbfcdb566dcdb1
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