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From db657a96ca37d87cceff14db66645ba17024803c Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 19 Mar 2019 13:16:53 +0100
Subject: [PATCH] Resolves: CVE-2019-3855 - fix integer overflow in transport read
... resulting in out of bounds write
Upstream-Patch: https://libssh2.org/1.8.0-CVE/CVE-2019-3855.patch
---
src/transport.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/transport.c b/src/transport.c
index 8725da0..5349284 100644
--- a/src/transport.c
+++ b/src/transport.c
@@ -434,8 +434,12 @@ int _libssh2_transport_read(LIBSSH2_SESSION * session)
* and we can extract packet and padding length from it
*/
p->packet_length = _libssh2_ntohu32(block);
- if (p->packet_length < 1)
+ if(p->packet_length < 1) {
return LIBSSH2_ERROR_DECRYPT;
+ }
+ else if(p->packet_length > LIBSSH2_PACKET_MAXPAYLOAD) {
+ return LIBSSH2_ERROR_OUT_OF_BOUNDARY;
+ }
p->padding_length = block[4];
--
2.17.2
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