harden client reply parsers against malformed server replies - #655
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drakkan wants to merge 1 commit into
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harden client reply parsers against malformed server replies#655drakkan wants to merge 1 commit into
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The client response decoders parsed server replies with the unchecked unmarshalUint32/unmarshalString helpers and with fixed-offset reads in unmarshalStatus. A malicious or compromised server could return a truncated or oversized reply and panic the client goroutine with an index- or slice-bounds-out-of-range. Convert these paths to the bounds-checked Safe variants and clamp the data-length before slicing, so a hostile reply returns an error instead of panicking. Reported by @mjbommar
puellanivis
reviewed
Jul 13, 2026
| } | ||
| count, data := unmarshalUint32(data) | ||
| for i := uint32(0); i < count; i++ { | ||
| for i := 0; i < count; i++ { |
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We can switch this to range i since we’re here.
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| if len(body) >= 5 { | ||
| id, _ = unmarshalUint32(body[1:]) | ||
| } |
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I think if this is false, then this would be an error… at least a ok == false situation.
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The client response decoders parsed server replies with the unchecked unmarshalUint32/unmarshalString helpers and with fixed-offset reads in unmarshalStatus. A malicious or compromised server could return a truncated or oversized reply and panic the client goroutine with an index- or slice-bounds-out-of-range. Convert these paths to the bounds-checked Safe variants and clamp the data-length before slicing, so a hostile reply returns an error instead of panicking.
Reported by @mjbommar