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validate addr length before reading (#6320)

This commit is contained in:
Alfredo Garcia 2023-03-14 22:49:14 -03:00 committed by GitHub
parent c75fb63385
commit ccb772278a
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1 changed files with 13 additions and 10 deletions
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23
zebra-network/src/protocol/external/addr/v2.rs vendored
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@ -15,8 +15,8 @@ use byteorder::{BigEndian, ReadBytesExt};
use thiserror::Error;
use zebra_chain::serialization::{
CompactSize64, DateTime32, SerializationError, TrustedPreallocate, ZcashDeserialize,
ZcashDeserializeInto,
zcash_deserialize_bytes_external_count, CompactSize64, DateTime32, SerializationError,
TrustedPreallocate, ZcashDeserialize, ZcashDeserializeInto,
};
use crate::{
@ -282,19 +282,22 @@ impl ZcashDeserialize for AddrV2 {
// See the list of reserved network IDs in ZIP 155.
let network_id = reader.read_u8()?;
// > CompactSize The length in bytes of addr.
// > uint8[sizeAddr] Network address. The interpretation depends on networkID.
let addr: Vec<u8> = (&mut reader).zcash_deserialize_into()?;
// > uint16 Network port. If not relevant for the network this MUST be 0.
let port = reader.read_u16::<BigEndian>()?;
if addr.len() > MAX_ADDR_V2_ADDR_SIZE {
// > CompactSize The length in bytes of addr.
let max_size = MAX_ADDR_V2_ADDR_SIZE as u64; // `MAX_ADDR_V2_ADDR_SIZE` fits in `u64`.
let addr_len: CompactSize64 = (&mut reader).zcash_deserialize_into()?;
if addr_len > CompactSize64::from(max_size) {
return Err(SerializationError::Parse(
"addr field longer than MAX_ADDR_V2_ADDR_SIZE in addrv2 message",
));
}
// > uint8[sizeAddr] Network address. The interpretation depends on networkID.
let addr: Vec<u8> =
zcash_deserialize_bytes_external_count(u64::from(addr_len) as usize, &mut reader)?;
// > uint16 Network port. If not relevant for the network this MUST be 0.
let port = reader.read_u16::<BigEndian>()?;
let ip = if network_id == ADDR_V2_IPV4_NETWORK_ID {
AddrV2::ip_addr_from_bytes::<ADDR_V2_IPV4_ADDR_SIZE>(addr)?
} else if network_id == ADDR_V2_IPV6_NETWORK_ID {