Impact
Trying to read malformed HAMT sharded directories can cause panics and virtual memory leaks.
If you are reading untrusted user input, an attacker can then trigger a panic.
This is caused by bogus fanout parameter in the HAMT directory nodes.
This include checks returned in ipfs/go-bitfield GHSA-2h6c-j3gf-xp9r, as well as limiting the fanout to <= 1024 (to avoid attempts of arbitrary sized allocations).
Patches
Workarounds
Do not feed untrusted user data to the decoding functions.
References
Impact
Trying to read malformed HAMT sharded directories can cause panics and virtual memory leaks.
If you are reading untrusted user input, an attacker can then trigger a panic.
This is caused by bogus
fanoutparameter in the HAMT directory nodes.This include checks returned in ipfs/go-bitfield GHSA-2h6c-j3gf-xp9r, as well as limiting the
fanoutto<= 1024(to avoid attempts of arbitrary sized allocations).Patches
Workarounds
Do not feed untrusted user data to the decoding functions.
References