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Bound hash-iterations in DNSSEC NSEC3 checking.

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Simon Kelley
2016-03-14 21:24:00 +00:00
parent b8ac466209
commit 40205a053e
1 changed files with 8 additions and 0 deletions
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8
src/dnssec.c
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@@ -1697,7 +1697,15 @@ static int prove_non_existence_nsec3(struct dns_header *header, size_t plen, uns
return 0;
p++; /* flags */
GETSHORT (iterations, p);
/* Upper-bound iterations, to avoid DoS.
Strictly, there are lower bounds for small keys, but
since we don't have key size info here, at least limit
to the largest bound, for 4096-bit keys. RFC 5155 10.3 */
if (iterations > 2500)
return 0;
salt_len = *p++;
salt = p;
if (!CHECK_LEN(header, salt, plen, salt_len))