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8d903be35a
This backports a fix for: * CVE-2018-0500 SMTP send heap buffer overflow See here for details: https://curl.haxx.se/docs/adv_2018-70a2.html Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
33 lines
1001 B
Diff
33 lines
1001 B
Diff
From ba1dbd78e5f1ed67c1b8d37ac89d90e5e330b628 Mon Sep 17 00:00:00 2001
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From: Daniel Stenberg <daniel@haxx.se>
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Date: Wed, 13 Jun 2018 12:24:40 +0200
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Subject: [PATCH] smtp: use the upload buffer size for scratch buffer malloc
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... not the read buffer size, as that can be set smaller and thus cause
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a buffer overflow! CVE-2018-0500
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Reported-by: Peter Wu
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Bug: https://curl.haxx.se/docs/adv_2018-70a2.html
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---
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lib/smtp.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/lib/smtp.c
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+++ b/lib/smtp.c
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@@ -1563,13 +1563,14 @@ CURLcode Curl_smtp_escape_eob(struct con
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if(!scratch || data->set.crlf) {
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oldscratch = scratch;
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- scratch = newscratch = malloc(2 * data->set.buffer_size);
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+ scratch = newscratch = malloc(2 * UPLOAD_BUFSIZE);
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if(!newscratch) {
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failf(data, "Failed to alloc scratch buffer!");
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return CURLE_OUT_OF_MEMORY;
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}
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}
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+ DEBUGASSERT(UPLOAD_BUFSIZE >= nread);
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/* Have we already sent part of the EOB? */
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eob_sent = smtp->eob;
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