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fragattack: note to code audit cache attacks

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Mathy Vanhoef 2020-10-26 04:59:38 +04:00
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@ -385,6 +385,12 @@ The last two tests are used to simulate our A-MSDU injection attack:
which can be useful in case there is a small delay between completion of the handshake and installing the
negotiated key.
- Overall it can be tedious to test if a device is vulnerable to cache attacks. Therefore I also recommend to
perform a code audit to check if fragments stay in the memory after disassociating or deauthenticating from
a network or after reassociating (this can also be dynamically checking using debug prints). If fragments
stay in memory, you should consider this as a risk, even if it's unknown whether it can be exploited. This
is similar to knowing an implementation has a buffer overflow but not (yet) knowing how to exploit it.
<a id="id-test-nonconsec"></a>
## 7.5. Non-consecutive PNs attack (§6.2 -- CVE-2020-26146)