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64 lines
1.8 KiB
64 lines
1.8 KiB
7 years ago
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From 5b2d738fb3e5d40590261702a8e7564a5b0e46d5 Mon Sep 17 00:00:00 2001
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From: Jeremy Allison <jra@samba.org>
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Date: Tue, 19 Sep 2017 16:11:33 -0700
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Subject: [PATCH] s3: smbd: Fix SMB1 use-after-free crash bug. CVE-2017-14746
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When setting up the chain, always use 'next->' variables
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not the 'req->' one.
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Bug discovered by 连一汉 <lianyihan@360.cn>
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CVE-2017-14746
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=13041
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Signed-off-by: Jeremy Allison <jra@samba.org>
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---
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source3/smbd/process.c | 7 ++++---
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source3/smbd/reply.c | 5 +++++
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2 files changed, 9 insertions(+), 3 deletions(-)
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diff --git a/source3/smbd/process.c b/source3/smbd/process.c
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index b65ae2c1b1c..9b2b0a669a2 100644
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--- a/source3/smbd/process.c
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+++ b/source3/smbd/process.c
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@@ -1855,12 +1855,13 @@ void smb_request_done(struct smb_request *req)
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next->vuid = SVAL(req->outbuf, smb_uid);
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next->tid = SVAL(req->outbuf, smb_tid);
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- status = smb1srv_tcon_lookup(req->xconn, req->tid,
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+ status = smb1srv_tcon_lookup(req->xconn, next->tid,
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now, &tcon);
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+
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if (NT_STATUS_IS_OK(status)) {
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- req->conn = tcon->compat;
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+ next->conn = tcon->compat;
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} else {
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- req->conn = NULL;
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+ next->conn = NULL;
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}
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next->chain_fsp = req->chain_fsp;
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next->inbuf = req->inbuf;
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diff --git a/source3/smbd/reply.c b/source3/smbd/reply.c
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index 7b07078249b..81acedf0413 100644
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--- a/source3/smbd/reply.c
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+++ b/source3/smbd/reply.c
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@@ -923,6 +923,11 @@ void reply_tcon_and_X(struct smb_request *req)
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}
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TALLOC_FREE(tcon);
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+ /*
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+ * This tree id is gone. Make sure we can't re-use it
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+ * by accident.
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+ */
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+ req->tid = 0;
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}
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if ((passlen > MAX_PASS_LEN) || (passlen >= req->buflen)) {
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--
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2.14.2.920.gcf0c67979c-goog
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