diff options
Diffstat (limited to 'gnu/packages/patches/openssh-memory-exhaustion.patch')
| -rw-r--r-- | gnu/packages/patches/openssh-memory-exhaustion.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gnu/packages/patches/openssh-memory-exhaustion.patch b/gnu/packages/patches/openssh-memory-exhaustion.patch new file mode 100644 index 0000000000..91fe294ca4 --- /dev/null +++ b/gnu/packages/patches/openssh-memory-exhaustion.patch @@ -0,0 +1,39 @@ +Fix a memory exhaustion bug in the key exchange, whereby an unauthenticated user +could potentially consume 38400 MB of memory on the server: + +http://seclists.org/oss-sec/2016/q4/185 + +Patch adapted from upstream source repository: + +https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad + +From ec165c392ca54317dbe3064a8c200de6531e89ad Mon Sep 17 00:00:00 2001 +From: "markus@openbsd.org" <markus@openbsd.org> +Date: Mon, 10 Oct 2016 19:28:48 +0000 +Subject: [PATCH] upstream commit + +Unregister the KEXINIT handler after message has been +received. Otherwise an unauthenticated peer can repeat the KEXINIT and cause +allocation of up to 128MB -- until the connection is closed. Reported by +shilei-c at 360.cn + +Upstream-ID: 43649ae12a27ef94290db16d1a98294588b75c05 +--- + kex.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/kex.c b/kex.c +index 3f97f8c..6a94bc5 100644 +--- a/kex.c ++++ b/kex.c +@@ -481,6 +481,7 @@ kex_input_kexinit(int type, u_int32_t seq, void *ctxt) + if (kex == NULL) + return SSH_ERR_INVALID_ARGUMENT; + ++ ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, NULL); + ptr = sshpkt_ptr(ssh, &dlen); + if ((r = sshbuf_put(kex->peer, ptr, dlen)) != 0) + return r; +-- +2.10.1 + |