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| Web-applets OpenSSL broken RNG
| [[SPL_services|csrng]] access was added to web-applets with [12.1.0+]. Prior to that, csrng and nn::os::GenerateRandomBytes were not used (besides sdk heap code).
nn::os::GetSystemTick is used to seed the OpenSSL RNG, among other data. Hence, it's probably (?) possible to bruteforce the RNG initial state, allowing predicting RNG output.
The RNG code is wkcRandomNumbersPeer (peer_wkc nro), with the initialization code using GetSystemTick located in the func immediately before wkcGetTickCountPeer. The former is called from wkcOsslRandFilefReadPeer. wkcOsslRandFilefReadPeer is called for seeding the OpenSSL RNG.
With [12.1.0+], wkcRandomNumberPeer/wkcRandomNumbersPeer wrap nn::os::GenerateRandomBytes. wkcCryptographicallyRandomValuesPeer was added which wraps nn::crypto::GenerateCryptographicallyRandomBytes. wkcOsslRandFilefReadPeer now calls nn::crypto::GenerateCryptographicallyRandomBytes instead of wkcRandomNumbersPeer.
| Breaking web-applets OpenSSL RNG -> potentially predict RNG data (keys(?)) during TLS comms.
| [[12.1.0]]
| [[12.1.0]]
| January 28, 2022
| October 8, 2024
| [[User:Yellows8|yellows8]], likely (?) others
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