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From 81c0e81531623251a0e78f7779c049f530abe733 Mon Sep 17 00:00:00 2001
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From: Daniel Stenberg <daniel@haxx.se>
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Date: Wed, 2 Jan 2019 20:33:08 +0100
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Subject: [PATCH] NTLM: fix size check condition for type2 received data
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Bug: https://curl.haxx.se/docs/CVE-2018-16890.html
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Reported-by: Wenxiang Qian
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CVE-2018-16890
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Upstream-commit: b780b30d1377adb10bbe774835f49e9b237fb9bb
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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lib/vauth/ntlm.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/lib/vauth/ntlm.c b/lib/vauth/ntlm.c
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index cdb8d8f..b614cda 100644
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--- a/lib/vauth/ntlm.c
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+++ b/lib/vauth/ntlm.c
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@@ -182,10 +182,11 @@ static CURLcode ntlm_decode_type2_target(struct Curl_easy *data,
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target_info_len = Curl_read16_le(&buffer[40]);
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target_info_offset = Curl_read32_le(&buffer[44]);
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if(target_info_len > 0) {
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- if(((target_info_offset + target_info_len) > size) ||
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+ if((target_info_offset >= size) ||
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+ ((target_info_offset + target_info_len) > size) ||
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(target_info_offset < 48)) {
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infof(data, "NTLM handshake failure (bad type-2 message). "
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- "Target Info Offset Len is set incorrect by the peer\n");
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+ "Target Info Offset Len is set incorrect by the peer\n");
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return CURLE_BAD_CONTENT_ENCODING;
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}
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--
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2.17.2
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