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The racoon daemon in IPsec-Tools 0.8.2 contains a remotely exploitable computational-complexity attack when parsing and storing ISAKMP fragments. The implementation permits a remote attacker to exhaust computational resources on the remote endpoint by repeatedly sending ISAKMP fragment packets in a particular order such that the worst-case computational complexity is realized in the algorithm utilized to determine if reassembly of the fragments can take place. The fix obtained from NetBSD CVS head with a command: cvs diff -D 2017-01-24 -D 2017-09-01 \ src/racoon/handler.h \ src/racoon/isakmp.c \ src/racoon/isakmp_frag.c \ src/racoon/isakmp_inf.c While here, add LICENSE. PR: 225066 Approved by: VANHULLEBUS Yvan (maintainer timeout, 3 months) Obtained from: NetBSD MFH: 2018Q1 Security: CVE-2016-10396
30 lines
958 B
C
30 lines
958 B
C
Index: src/racoon/isakmp.c
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===================================================================
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RCS file: /cvsroot/src/crypto/dist/ipsec-tools/src/racoon/isakmp.c,v
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retrieving revision 1.75
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retrieving revision 1.76
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diff -p -u -r1.75 -r1.76
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--- src/racoon/isakmp.c 9 Mar 2016 22:27:17 -0000 1.75
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+++ src/racoon/isakmp.c 24 Jan 2017 19:23:56 -0000 1.76
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@@ -1,4 +1,4 @@
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-/* $NetBSD: isakmp.c,v 1.75 2016/03/09 22:27:17 christos Exp $ */
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+/* $NetBSD: isakmp.c,v 1.76 2017/01/24 19:23:56 christos Exp $ */
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/* Id: isakmp.c,v 1.74 2006/05/07 21:32:59 manubsd Exp */
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@@ -1077,6 +1077,7 @@ isakmp_ph1begin_i(rmconf, remote, local)
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iph1->frag = 1;
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else
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iph1->frag = 0;
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+ iph1->frag_last_index = 0;
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iph1->frag_chain = NULL;
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#endif
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iph1->approval = NULL;
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@@ -1181,6 +1182,7 @@ isakmp_ph1begin_r(msg, remote, local, et
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#endif
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#ifdef ENABLE_FRAG
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iph1->frag = 0;
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+ iph1->frag_last_index = 0;
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iph1->frag_chain = NULL;
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#endif
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iph1->approval = NULL;
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