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diff -up openssh-6.8p1/compat.c.cisco-dh openssh-6.8p1/compat.c
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--- openssh-6.8p1/compat.c.cisco-dh 2015-03-17 06:49:20.000000000 +0100
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+++ openssh-6.8p1/compat.c 2015-03-19 12:57:58.862606969 +0100
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@@ -167,6 +167,7 @@ compat_datafellows(const char *version)
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SSH_BUG_SCANNER },
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{ "Probe-*",
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SSH_BUG_PROBE },
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+ { "Cisco-*", SSH_BUG_MAX4096DH },
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{ NULL, 0 }
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};
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diff -up openssh-6.8p1/compat.h.cisco-dh openssh-6.8p1/compat.h
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--- openssh-6.8p1/compat.h.cisco-dh 2015-03-17 06:49:20.000000000 +0100
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+++ openssh-6.8p1/compat.h 2015-03-19 12:57:58.862606969 +0100
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@@ -60,6 +60,7 @@
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#define SSH_NEW_OPENSSH 0x04000000
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#define SSH_BUG_DYNAMIC_RPORT 0x08000000
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#define SSH_BUG_CURVE25519PAD 0x10000000
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+#define SSH_BUG_MAX4096DH 0x20000000
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void enable_compat13(void);
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void enable_compat20(void);
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diff -up openssh-6.8p1/kexgexc.c.cisco-dh openssh-6.8p1/kexgexc.c
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--- openssh-6.8p1/kexgexc.c.cisco-dh 2015-03-19 12:57:58.862606969 +0100
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+++ openssh-6.8p1/kexgexc.c 2015-03-19 13:11:52.320519969 +0100
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@@ -64,8 +64,27 @@ kexgex_client(struct ssh *ssh)
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kex->min = DH_GRP_MIN;
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kex->max = DH_GRP_MAX;
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+
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+ /* Servers with MAX4096DH need a preferred size (nbits) <= 4096.
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+ * We need to also ensure that min < nbits < max */
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+
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+ if (datafellows & SSH_BUG_MAX4096DH) {
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+ /* The largest min for these servers is 4096 */
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+ kex->min = MIN(kex->min, 4096);
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+ }
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+
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kex->nbits = nbits;
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- if (ssh->compat & SSH_OLD_DHGEX) {
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+ kex->nbits = MIN(nbits, kex->max);
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+ kex->nbits = MAX(nbits, kex->min);
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+
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+ if (ssh->compat & SSH_BUG_MAX4096DH) {
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+ /* Cannot have a nbits > 4096 for these servers */
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+ kex->nbits = MIN(kex->nbits, 4096);
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+ /* nbits has to be powers of two */
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+ if (kex->nbits == 3072)
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+ kex->nbits = 4096;
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+ }
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+ if (ssh->compat & SSH_OLD_DHGEX) { /* Old GEX request */
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/* Old GEX request */
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if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_DH_GEX_REQUEST_OLD))
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!= 0 ||
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