Blame SOURCES/openssh-7.4p1-cbc-weakness.patch
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commit 0fb1a617a07b8df5de188dd5a0c8bf293d4bfc0e
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Author: markus@openbsd.org <markus@openbsd.org>
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Date: Sat Mar 11 13:07:35 2017 +0000
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upstream commit
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Don't count the initial block twice when computing how
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many bytes to discard for the work around for the attacks against CBC-mode.
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ok djm@; report from Jean Paul, Kenny, Martin and Torben @ RHUL
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Upstream-ID: f445f509a4e0a7ba3b9c0dae7311cb42458dc1e2
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diff --git a/packet.c b/packet.c
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index 01e2d45..2f3a2ec 100644
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--- a/packet.c
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+++ b/packet.c
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@@ -1850,11 +1850,11 @@ ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
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if (r != SSH_ERR_MAC_INVALID)
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goto out;
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logit("Corrupted MAC on input.");
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- if (need > PACKET_MAX_SIZE)
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+ if (need + block_size > PACKET_MAX_SIZE)
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return SSH_ERR_INTERNAL_ERROR;
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return ssh_packet_start_discard(ssh, enc, mac,
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sshbuf_len(state->incoming_packet),
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- PACKET_MAX_SIZE - need);
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+ PACKET_MAX_SIZE - need - block_size);
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}
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/* Remove MAC from input buffer */
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DBG(debug("MAC #%d ok", state->p_read.seqnr));
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