[R4R]les: fix GetProofsV2 bug (#21896) #54
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unclezoro
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yutianwu
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Jan 8, 2021
abelliumnt
approved these changes
Jan 8, 2021
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Description
This PR fixes a bug in GetProofsV2 request serving that could potentially cause a panic because of header being nil.
Rationale
A DoS vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client.
Example
Mirror PR: ethereum/go-ethereum#21896
advisories: GHSA-r33q-22hv-j29q
Changes
This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit.
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