package/strongswan: add patch to fix CVE-2025-62291

https://nvd.nist.gov/vuln/detail/CVE-2025-62291

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
[Marcus: add comment pointing to patch before _IGNORE_CVES]
Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>

package/strongswan/0001-eap_mschapv2_failure_request_len.patch

@@ -0,0 +1,46 @@
+From dda24815d148b91209ebf2d27e3a7acefe9b6435 Mon Sep 17 00:00:00 2001
+From: Tobias Brunner <tobias@strongswan.org>
+Date: Thu, 9 Oct 2025 11:33:45 +0200
+Subject: [PATCH] eap-mschapv2: Fix length check for Failure Request packets on
+ the client
+
+For message lengths between 6 and 8, subtracting HEADER_LEN (9) causes
+`message_len` to become negative, which is then used in calls to malloc()
+and memcpy() that both take size_t arguments, causing an integer
+underflow.
+
+For 6 and 7, the huge size requested from malloc() will fail (it exceeds
+PTRDIFF_MAX) and the returned NULL pointer will cause a segmentation
+fault in memcpy().
+
+However, for 8, the allocation is 0, which succeeds.  But then the -1
+passed to memcpy() causes a heap-based buffer overflow (and possibly a
+segmentation fault when attempting to read/write that much data).
+Fortunately, if compiled with -D_FORTIFY_SOURCE=3 (the default on e.g.
+Ubuntu), the compiler will use __memcpy_chk(), which prevents that buffer
+overflow and causes the daemon to get aborted immediately instead.
+
+Fixes: f98cdf7a4765 ("adding plugin for EAP-MS-CHAPv2")
+Fixes: CVE-2025-62291
+Upstream: https://github.com/strongswan/strongswan/commit/c687ada6a6f68913651e355fd09f906893096b32
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+---
+ src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c b/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c
+index 21cc95a6a360..35faad2e0bb5 100644
+--- a/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c
++++ b/src/libcharon/plugins/eap_mschapv2/eap_mschapv2.c
+@@ -974,7 +974,7 @@ static status_t process_peer_failure(private_eap_mschapv2_t *this,
+ 	data = in->get_data(in);
+ 	eap = (eap_mschapv2_header_t*)data.ptr;
+ 
+-	if (data.len < 3) /* we want at least an error code: E=e */
++	if (data.len < HEADER_LEN + 3) /* we want at least an error code: E=e */
+ 	{
+ 		DBG1(DBG_IKE, "received invalid EAP-MS-CHAPv2 message: too short");
+ 		return FAILED;
+-- 
+2.43.0
+

package/strongswan/strongswan.mk

@@ -12,6 +12,8 @@ STRONGSWAN_LICENSE_FILES = COPYING LICENSE
 STRONGSWAN_CPE_ID_VENDOR = strongswan
 STRONGSWAN_DEPENDENCIES = host-pkgconf
 STRONGSWAN_INSTALL_STAGING = YES
+# 0001-eap_mschapv2_failure_request_len.patch
+STRONGSWAN_IGNORE_CVES += CVE-2025-62291
 STRONGSWAN_CONF_OPTS += \
 	--without-lib-prefix \
 	--enable-led \