vulnerability / NVI-00014996 / Revision 1
GoPacket's Diameter AVP decoder: uint32 underflow on vendor header size leads to unbounded ~4 GiB allocation (unauthenticated remote DoS)
GitHub lists this reviewed advisory for github.com/gopacket/gopacket. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
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01 / Meaning
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02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
github.com/gopacket/gopacket
source listed<= 1.6.0
## Summary The Diameter AVP decoder in `github.com/gopacket/gopacket` computes `dataLength := avp.Length - uint32(headerSize)` without first ensuring `avp.Length >= headerSize`. When the Vendor flag is set, `headerSize` is 12, but the only length guard upstream rejects `avp.Length CWE-770 unbounded allocation). ## Root cause (file:line @ v1.6.0) `layers/diameter_avp_decoders.go`, `decodeDiameterAVP`: ```go avp.Length = uint32(data[5])<<16 | uint32(data[6])<<8 | uint32(data[7]) // 24-bit wire value if avp.Length < 8 { // only rejects < 8 return DiameterAVP{}, 0, fmt.Errorf("invalid AVP length: %d", avp.Length) } headerSize := 8 dataOffset := 8 if avp.Flags.Vendor { // Vendor flag = wire bit data[4] &
03 / Response
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04 / Limits
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05 / Provenance
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- GHSA-6r28-9ppf-4hj5 ↗
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- Revision 1 ·
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