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Check answer_len in the remap_addr case of process_relay_cell_not_open.

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Fix an edge case where a malicious exit relay could convince a
controller that the client's DNS question resolves to an internal IP
address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
This commit is contained in:
Roger Dingledine 2009-06-12 11:18:02 -04:00 committed by Nick Mathewson
parent c50098ffc5
commit 845326317d
2 changed files with 6 additions and 1 deletions
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5
ChangeLog
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@ -1,4 +1,9 @@
Changes in version 0.2.1.16-?? - 2009-??-??
o Security fixes:
- Fix an edge case where a malicious exit relay could convince a
controller that the client's DNS question resolves to an internal IP
address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
o Major performance improvements (on 0.2.0.x):
- Disable and refactor some debugging checks that forced a linear scan
over the whole server-side DNS cache. These accounted for over 50%

2
src/or/relay.c
View File

@ -947,7 +947,7 @@ connection_edge_process_relay_cell_not_open(
cell->payload+RELAY_HEADER_SIZE+2, /*answer*/
ttl,
-1);
if (answer_type == RESOLVED_TYPE_IPV4) {
if (answer_type == RESOLVED_TYPE_IPV4 && answer_len >= 4) {
uint32_t addr = ntohl(get_uint32(cell->payload+RELAY_HEADER_SIZE+2));
remap_event_helper(conn, addr);
}