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strongswan: backport upstream fixes for CVEs in gmp plugin

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This fixes:
* CVE-2018-16151
* CVE-2018-16152
* CVE-2018-17540

Details:
https://strongswan.org/blog/2018/09/24/strongswan-vulnerability-(cve-2018-16151,-cve-2018-16152).html
https://strongswan.org/blog/2018/10/01/strongswan-vulnerability-(cve-2018-17540).html

Signed-off-by: Magnus Kroken <mkroken@gmail.com>
This commit is contained in:
Magnus Kroken
2018-10-06 01:23:32 +02:00
committed by Hans Dedecker
parent c6a9b01a62
commit b6f6df1d77
3 changed files with 361 additions and 1 deletions
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net/strongswan/patches/011-gmp-cve-2018-17540.patch
+38
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@@ -0,0 +1,38 @@
From 129ab919a8c3abfc17bea776f0774e0ccf33ca09 Mon Sep 17 00:00:00 2001
From: Tobias Brunner <tobias@strongswan.org>
Date: Tue, 25 Sep 2018 14:50:08 +0200
Subject: [PATCH] gmp: Fix buffer overflow with very small RSA keys
Because `keylen` is unsigned the subtraction results in an integer
underflow if the key length is < 11 bytes.
This is only a problem when verifying signatures with a public key (for
private keys the plugin enforces a minimum modulus length) and to do so
we usually only use trusted keys. However, the x509 plugin actually
calls issued_by() on a parsed certificate to check if it is self-signed,
which is the reason this issue was found by OSS-Fuzz in the first place.
So, unfortunately, this can be triggered by sending an invalid client
cert to a peer.
Fixes: 5955db5b124a ("gmp: Don't parse PKCS1 v1.5 RSA signatures to verify them")
Fixes: CVE-2018-17540
---
src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c b/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
index e9a83fdf49a1..a255a40abce2 100644
--- a/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
+++ b/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
@@ -301,7 +301,7 @@ bool gmp_emsa_pkcs1_signature_data(hash_algorithm_t hash_algorithm,
data = digestInfo;
}
- if (data.len > keylen - 11)
+ if (keylen < 11 || data.len > keylen - 11)
{
chunk_free(&digestInfo);
DBG1(DBG_LIB, "signature value of %zu bytes is too long for key of "
--
2.7.4