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GHSA-q669-2vfg-cxcg
No affected components available
via bounty@nervos.org
There are multiple type conversions in ckb that unsafely cast between byte pointers and other types of pointers. This results in unaligned pointers, which are not allowed by the Rust language, and are considered undefined behavior, meaning that the compiler is free to do anything with code. This can lead to unpredictable bugs that can become security vulnerabilities.
Some of the bugs here could potentially lead to buffer overreads in malformed data (it's not clear to me as I haven't investigated the practical impact of these bugs).
Two of these (in blockchain.rs) do not create unaligned data. They do though perform an unsafe operation that may not uphold the invariants of the safe function they are in, and could lead to undefined behavior and buffer overreads on malformed input.
These are of the same nature as those in my previous report about the molecule crate.
Patch attached for commit 1b09e37c8e1b7945495cd18d9782417fbe51e986 that fixes all cases I know of at this time.
Please consider this report for reward under the terms of the bug bounty program.
Related advisory: https://github.com/nervosnetwork/molecule/security/advisories/GHSA-rffv-8x7x-p7pw
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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