curl: fix CVE-2025-10148

curl's websocket code did not update the 32 bit mask pattern
for each new outgoing frame as the specification says. Instead
it used a fixed mask that persisted and was used throughout
the entire connection.

A predictable mask pattern allows for a malicious server to induce
traffic between the two communicating parties that could be
interpreted by an involved proxy (configured or transparent) as
genuine, real, HTTP traffic with content and thereby poison its
cache. That cached poisoned content could then be served to all
users of that proxy.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2025-10148

Upstream patch:
https://github.com/curl/curl/commit/84db7a9eae8468c0445b15aa806fa

(From OE-Core rev: 83420a408551688ebb298b88b16d2e384e9b7bfd)

Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 58 insertions, 0 deletions

diff --git a/meta/recipes-support/curl/curl/CVE-2025-10148.patch b/meta/recipes-support/curl/curl/CVE-2025-10148.patch
new file mode 100644
index 0000000000..7bc5d18396
--- /dev/null
+++ b/meta/recipes-support/curl/curl/CVE-2025-10148.patch
@@ -0,0 +1,57 @@
+From 84db7a9eae8468c0445b15aa806fa7fa806fa0f2 Mon Sep 17 00:00:00 2001
+From: Daniel Stenberg <daniel@haxx.se>
+Date: Mon, 8 Sep 2025 14:14:15 +0200
+Subject: [PATCH] ws: get a new mask for each new outgoing frame
+
+Reported-by: Calvin Ruocco
+Closes #18496
+
+CVE: CVE-2025-10148
+Upstream-Status: Backport [https://github.com/curl/curl/commit/84db7a9eae8468c0445b15aa806fa]
+
+Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
+---
+ lib/ws.c | 21 +++++++++++++--------
+ 1 file changed, 13 insertions(+), 8 deletions(-)
+
+diff --git a/lib/ws.c b/lib/ws.c
+index 25d19c6..029172d 100644
+--- a/lib/ws.c
++++ b/lib/ws.c
+@@ -637,6 +637,18 @@ static ssize_t ws_enc_write_head(struct Curl_easy *data,
+   enc->payload_remain = enc->payload_len = payload_len;
+   ws_enc_info(enc, data, "sending");
+
++    /* 4 bytes random */
++
++  result = Curl_rand(data, (unsigned char *)&enc->mask, sizeof(enc->mask));
++  if(result)
++    return result;
++
++#ifdef DEBUGBUILD
++  if(getenv("CURL_WS_FORCE_ZERO_MASK"))
++    /* force the bit mask to 0x00000000, effectively disabling masking */
++    memset(&enc->mask, 0, sizeof(enc->mask));
++#endif
++
+   /* add 4 bytes mask */
+   memcpy(&head[hlen], &enc->mask, 4);
+   hlen += 4;
+@@ -819,14 +831,7 @@ CURLcode Curl_ws_accept(struct Curl_easy *data,
+      subprotocol not requested by the client), the client MUST Fail
+      the WebSocket Connection. */
+
+-  /* 4 bytes random */
+-
+-  result = Curl_rand(data, (unsigned char *)&ws->enc.mask,
+-                     sizeof(ws->enc.mask));
+-  if(result)
+-    return result;
+-  infof(data, "Received 101, switch to WebSocket; mask %02x%02x%02x%02x",
+-        ws->enc.mask[0], ws->enc.mask[1], ws->enc.mask[2], ws->enc.mask[3]);
++  infof(data, "Received 101, switch to WebSocket");
+
+   /* Install our client writer that decodes WS frames payload */
+   result = Curl_cwriter_create(&ws_dec_writer, data, &ws_cw_decode,
+--
+2.40.0
diff --git a/meta/recipes-support/curl/curl_8.12.1.bb b/meta/recipes-support/curl/curl_8.12.1.bb
index 0fb3719ac2..bfe0075af7 100644
--- a/meta/recipes-support/curl/curl_8.12.1.bb
+++ b/meta/recipes-support/curl/curl_8.12.1.bb
@@ -15,6 +15,7 @@ SRC_URI = " \
     file://disable-tests \
     file://no-test-timeout.patch \
     file://CVE-2025-9086.patch \
+    file://CVE-2025-10148.patch \
 "
 
 SRC_URI:append:class-nativesdk = " \