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bind: fix for CVE-2012-3817
Upstream-Status: Backport
ISC BIND 9.4.x, 9.5.x, 9.6.x, and 9.7.x before 9.7.6-P2; 9.8.x before 9.8.3-P2;
9.9.x before 9.9.1-P2; and 9.6-ESV before 9.6-ESV-R7-P2, when DNSSEC validation
is enabled, does not properly initialize the failing-query cache, which allows
remote attackers to cause a denial of service (assertion failure and daemon exit)
by sending many queries.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3817
This patch is back-ported from bind-9.3.6-20.P1.el5_8.2.src.rpm package.
Signed-off-by: Ming Liu <ming.liu@windriver.com>
---
resolver.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -8318,6 +8318,7 @@ dns_resolver_addbadcache(dns_resolver_t
goto cleanup;
bad->type = type;
bad->hashval = hashval;
+ bad->expire = *expire;
isc_buffer_init(&buffer, bad + 1, name->length);
dns_name_init(&bad->name, NULL);
dns_name_copy(name, &bad->name, &buffer);
@@ -8329,8 +8330,8 @@ dns_resolver_addbadcache(dns_resolver_t
if (resolver->badcount < resolver->badhash * 2 &&
resolver->badhash > DNS_BADCACHE_SIZE)
resizehash(resolver, &now, ISC_FALSE);
- }
- bad->expire = *expire;
+ } else
+ bad->expire = *expire;
cleanup:
UNLOCK(&resolver->lock);
}
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