An uninitiated structure introduced by the fix from, introduces random authentication failures: https://osdir.com/ml/ubuntu-bugs/2015-08/msg10633.html
Index: openssh-5.9p1/auth2-chall.c =================================================================== --- openssh-5.9p1.orig/auth2-chall.c 2015-08-17 17:25:47.942709117 +0000 +++ openssh-5.9p1/auth2-chall.c 2015-08-17 17:27:09.579844573 +0000 @@ -131,6 +131,7 @@ kbdintctxt->ctxt = NULL; kbdintctxt->device = NULL; kbdintctxt->nreq = 0; + kbdintctxt->devices_done = 0; return kbdintctxt; }
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