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diff -up ntp-4.2.6p5/ntpd/ntp_proto.c.cve-2015-1798 ntp-4.2.6p5/ntpd/ntp_proto.c
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--- ntp-4.2.6p5/ntpd/ntp_proto.c.cve-2015-1798 2015-04-08 12:50:57.997021032 +0200
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+++ ntp-4.2.6p5/ntpd/ntp_proto.c 2015-04-08 12:50:58.005021047 +0200
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@@ -1130,18 +1130,20 @@ receive(
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return;
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/*
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- * If the digest fails, the client cannot authenticate a server
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+ * If the digest fails or it's missing for authenticated
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+ * associations, the client cannot authenticate a server
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* reply to a client packet previously sent. The loopback check
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* is designed to avoid a bait-and-switch attack, which was
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* possible in past versions. If symmetric modes, return a
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* crypto-NAK. The peer should restart the protocol.
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*/
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- } else if (!AUTH(has_mac || (restrict_mask & RES_DONTTRUST),
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- is_authentic)) {
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+ } else if (!AUTH(peer->keyid || has_mac ||
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+ (restrict_mask & RES_DONTTRUST), is_authentic)) {
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report_event(PEVNT_AUTH, peer, "digest");
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peer->flash |= TEST5; /* bad auth */
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peer->badauth++;
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- if (hismode == MODE_ACTIVE || hismode == MODE_PASSIVE)
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+ if (has_mac &&
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+ (hismode == MODE_ACTIVE || hismode == MODE_PASSIVE))
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fast_xmit(rbufp, MODE_ACTIVE, 0, restrict_mask);
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if (peer->flags & FLAG_PREEMPT) {
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unpeer(peer);
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