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fix: reject malformed monster move payloads

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Kelsi 2026-03-14 21:49:30 -07:00
parent f57893a459
commit bce1f4d211
1 changed files with 22 additions and 15 deletions
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37
src/game/world_packets.cpp
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@ -3172,12 +3172,10 @@ bool MonsterMoveParser::parse(network::Packet& packet, MonsterMoveData& data) {
if (pointCount == 0) return true;
// Cap pointCount to prevent excessive iteration from malformed packets
// Reject extreme point counts from malformed packets.
constexpr uint32_t kMaxSplinePoints = 1000;
if (pointCount > kMaxSplinePoints) {
LOG_WARNING("SMSG_MONSTER_MOVE: pointCount=", pointCount, " exceeds max ", kMaxSplinePoints,
" (guid=0x", std::hex, data.guid, std::dec, "), capping");
pointCount = kMaxSplinePoints;
return false;
}
// Catmullrom or Flying → all waypoints stored as absolute float3 (uncompressed).
@ -3185,20 +3183,27 @@ bool MonsterMoveParser::parse(network::Packet& packet, MonsterMoveData& data) {
bool uncompressed = (data.splineFlags & (0x00080000 | 0x00002000)) != 0;
if (uncompressed) {
const size_t requiredBytes = static_cast<size_t>(pointCount) * 12ull;
if (packet.getReadPos() + requiredBytes > packet.getSize()) return false;
// Read last point as destination
// Skip to last point: each point is 12 bytes
for (uint32_t i = 0; i < pointCount - 1; i++) {
if (packet.getReadPos() + 12 > packet.getSize()) return true;
if (packet.getReadPos() + 12 > packet.getSize()) return false;
packet.readFloat(); packet.readFloat(); packet.readFloat();
}
if (packet.getReadPos() + 12 > packet.getSize()) return true;
if (packet.getReadPos() + 12 > packet.getSize()) return false;
data.destX = packet.readFloat();
data.destY = packet.readFloat();
data.destZ = packet.readFloat();
data.hasDest = true;
} else {
// Compressed: first 3 floats are the destination (final point)
if (packet.getReadPos() + 12 > packet.getSize()) return true;
size_t requiredBytes = 12;
if (pointCount > 1) {
requiredBytes += static_cast<size_t>(pointCount - 1) * 4ull;
}
if (packet.getReadPos() + requiredBytes > packet.getSize()) return false;
data.destX = packet.readFloat();
data.destY = packet.readFloat();
data.destZ = packet.readFloat();
@ -3282,16 +3287,19 @@ bool MonsterMoveParser::parseVanilla(network::Packet& packet, MonsterMoveData& d
if (pointCount == 0) return true;
// Cap pointCount to prevent excessive iteration from malformed packets
// Reject extreme point counts from malformed packets.
constexpr uint32_t kMaxSplinePoints = 1000;
if (pointCount > kMaxSplinePoints) {
LOG_WARNING("SMSG_MONSTER_MOVE(Vanilla): pointCount=", pointCount, " exceeds max ", kMaxSplinePoints,
" (guid=0x", std::hex, data.guid, std::dec, "), capping");
pointCount = kMaxSplinePoints;
return false;
}
size_t requiredBytes = 12;
if (pointCount > 1) {
requiredBytes += static_cast<size_t>(pointCount - 1) * 4ull;
}
if (packet.getReadPos() + requiredBytes > packet.getSize()) return false;
// First float[3] is destination.
if (packet.getReadPos() + 12 > packet.getSize()) return true;
data.destX = packet.readFloat();
data.destY = packet.readFloat();
data.destZ = packet.readFloat();
@ -3301,9 +3309,8 @@ bool MonsterMoveParser::parseVanilla(network::Packet& packet, MonsterMoveData& d
if (pointCount > 1) {
size_t skipBytes = static_cast<size_t>(pointCount - 1) * 4;
size_t newPos = packet.getReadPos() + skipBytes;
if (newPos <= packet.getSize()) {
packet.setReadPos(newPos);
}
if (newPos > packet.getSize()) return false;
packet.setReadPos(newPos);
}
LOG_DEBUG("MonsterMove(turtle): guid=0x", std::hex, data.guid, std::dec,