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From 50c9484278c63b958655a717844f0721263939cc Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 3 Jan 2019 12:59:28 +0100
Subject: [PATCH] ntlm: fix *_type3_message size check to avoid buffer overflow
Bug: https://curl.haxx.se/docs/CVE-2019-3822.html
Reported-by: Wenxiang Qian
CVE-2019-3822
---
lib/vauth/ntlm.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/lib/vauth/ntlm.c b/lib/vauth/ntlm.c
index 0ad4d972e3..6a8fc5ab3d 100644
--- a/lib/vauth/ntlm.c
+++ b/lib/vauth/ntlm.c
@@ -779,11 +779,14 @@ CURLcode Curl_auth_create_ntlm_type3_message(struct Curl_easy *data,
});
#if USE_NTRESPONSES
- if(size < (NTLM_BUFSIZE - ntresplen)) {
- DEBUGASSERT(size == (size_t)ntrespoff);
- memcpy(&ntlmbuf[size], ptr_ntresp, ntresplen);
- size += ntresplen;
+ /* ntresplen + size should not be risking an integer overflow here */
+ if(ntresplen + size > sizeof(ntlmbuf)) {
+ failf(data, "incoming NTLM message too big");
+ return CURLE_OUT_OF_MEMORY;
}
+ DEBUGASSERT(size == (size_t)ntrespoff);
+ memcpy(&ntlmbuf[size], ptr_ntresp, ntresplen);
+ size += ntresplen;
DEBUG_OUT({
fprintf(stderr, "\n ntresp=");
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