File curl-CVE-2022-35252.patch of Package curl.27750

From 20612d1797807826a5730dee2e74c876b8de01d9 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 22 Aug 2022 08:30:28 +0200
Subject: [PATCH] cookie: reject cookies with "control bytes"

Rejects 0x01 - 0x1f (except 0x09) plus 0x7f

Reported-by: Axel Chong
---
 lib/cookie.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Index: curl-7.79.1/lib/cookie.c
===================================================================
--- curl-7.79.1.orig/lib/cookie.c
+++ curl-7.79.1/lib/cookie.c
@@ -431,6 +431,30 @@ static bool bad_domain(const char *domai
 }
 
 /*
+  Syntax (from RFC 6265) says:
+
+  cookie-octet    = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
+
+  But Firefox and Chrome as of June 2022 accept space, comma and double-quotes
+  fine. The prime reason for filtering out control bytes is that some HTTP
+  servers return 400 for requests that contain such.
+*/
+static int invalid_octets(const char *p)
+{
+  /* Reject all bytes \x01 - \x1f (*except* \x09, TAB) + \x7f */
+  static const char badoctets[] = {
+    "\x01\x02\x03\x04\x05\x06\x07\x08\x0a"
+    "\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14"
+    "\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x7f"
+  };
+  size_t vlen, len;
+  /* scan for all the octets that are *not* in cookie-octet */
+  len = strcspn(p, badoctets);
+  vlen = strlen(p);
+  return (len != vlen);
+}
+
+/*
  * Curl_cookie_add
  *
  * Add a single cookie line to the cookie keeping object. Be aware that
@@ -582,6 +606,11 @@ Curl_cookie_add(struct Curl_easy *data,
             badcookie = TRUE;
             break;
           }
+          if(invalid_octets(whatptr) || invalid_octets(name)) {
+            infof(data, "invalid octets in name/value, cookie dropped");
+            badcookie = TRUE;
+            break;
+          }
         }
         else if(!len) {
           /*