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security: validate Apple MIDI packet length and name termination in RTP session

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Input Validation: High

The Apple MIDI command parser in module-rtp-session had two issues:

1. Insufficient minimum length check: the caller validated len >= 12,
   but struct rtp_apple_midi is 16 bytes (cmd + protocol + initiator +
   ssrc). Accessing hdr->ssrc on a 12-byte packet reads 4 bytes past
   the received data.

2. Missing null-termination check: the name field (flexible array
   member) from the network packet was passed directly to pw_log_info
   with %s format and to find_session_by_addr_name for string
   comparison, without verifying it contains a null terminator within
   the received data. This could read past the receive buffer into
   uninitialized stack memory, potentially leaking data into logs.

Fix by adding a sizeof check in parse_apple_midi_cmd and by validating
that the name is null-terminated within the received data in
parse_apple_midi_cmd_in.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Wim Taymans 2026-04-27 12:20:28 +02:00
parent 60e2857d82
commit 0d41a7b82f
1 changed files with 10 additions and 0 deletions
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10
src/modules/module-rtp-session.c
View file

@ -721,9 +721,17 @@ static void parse_apple_midi_cmd_in(struct impl *impl, bool ctrl, uint8_t *buffe
char addr[128]; char addr[128];
uint16_t port = 0; uint16_t port = 0;
if ((size_t)len < sizeof(*hdr))
return;
initiator = ntohl(hdr->initiator); initiator = ntohl(hdr->initiator);
ssrc = ntohl(hdr->ssrc); ssrc = ntohl(hdr->ssrc);
/* ensure the name field is null-terminated within the received data */
size_t name_area = len - sizeof(*hdr);
if (name_area == 0 || memchr(hdr->name, '\0', name_area) == NULL)
return;
pw_net_get_ip(sa, addr, sizeof(addr), NULL, &port); pw_net_get_ip(sa, addr, sizeof(addr), NULL, &port);
pw_log_info("IN from %s:%d %s ssrc:%08x initiator:%08x", pw_log_info("IN from %s:%d %s ssrc:%08x initiator:%08x",
addr, port, hdr->name, ssrc, initiator); addr, port, hdr->name, ssrc, initiator);
@ -962,6 +970,8 @@ static void parse_apple_midi_cmd(struct impl *impl, bool ctrl, uint8_t *buffer,
ssize_t len, struct sockaddr_storage *sa, socklen_t salen) ssize_t len, struct sockaddr_storage *sa, socklen_t salen)
{ {
struct rtp_apple_midi *hdr = (struct rtp_apple_midi*)buffer; struct rtp_apple_midi *hdr = (struct rtp_apple_midi*)buffer;
if ((size_t)len < sizeof(*hdr))
return;
switch (ntohl(hdr->cmd)) { switch (ntohl(hdr->cmd)) {
case APPLE_MIDI_CMD_IN: case APPLE_MIDI_CMD_IN:
parse_apple_midi_cmd_in(impl, ctrl, buffer, len, sa, salen); parse_apple_midi_cmd_in(impl, ctrl, buffer, len, sa, salen);