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commit 459b775a7eb5b26fb73b56c1a0f02548e53c45cc Author: Micah Elizabeth Scott beth@torproject.org AuthorDate: Mon May 15 12:11:00 2023 -0700
hs_pow: fix insufficient length check in pow-params
The descriptor validation table had an out of date minimum length for pow-params (3) whereas the spec and the current code expect at least 4 parameters. This was an opportunity for a malicious service to cause an assert failure in clients which attempted to parse its descriptor.
Addresses issue #40793
Signed-off-by: Micah Elizabeth Scott beth@torproject.org --- src/feature/hs/hs_descriptor.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/feature/hs/hs_descriptor.c b/src/feature/hs/hs_descriptor.c index d07f900e3a..7b519e4c78 100644 --- a/src/feature/hs/hs_descriptor.c +++ b/src/feature/hs/hs_descriptor.c @@ -155,7 +155,7 @@ static token_rule_t hs_desc_encrypted_v3_token_table[] = { T01(str_intro_auth_required, R3_INTRO_AUTH_REQUIRED, GE(1), NO_OBJ), T01(str_single_onion, R3_SINGLE_ONION_SERVICE, ARGS, NO_OBJ), T01(str_flow_control, R3_FLOW_CONTROL, GE(2), NO_OBJ), - T01(str_pow_params, R3_POW_PARAMS, GE(3), NO_OBJ), + T01(str_pow_params, R3_POW_PARAMS, GE(4), NO_OBJ), END_OF_TABLE };