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From 6e659993952aa5f90f48864be84a1bbb047fc258 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 25 Apr 2022 13:05:40 +0200
Subject: [PATCH] http: avoid auth/cookie on redirects same host diff port
CVE-2022-27776
Reported-by: Harry Sintonen
Bug: https://curl.se/docs/CVE-2022-27776.html
Closes #8749
---
lib/http.c | 34 ++++++++++++++++++++++------------
lib/urldata.h | 16 +++++++++-------
2 files changed, 31 insertions(+), 19 deletions(-)
CVE: CVE-2022-27776
Upstream-Status: Backport [https://github.com/curl/curl/commit/6e659993952aa5f90f48864be84a1bbb047fc258.patch]
Comment: Refreshed patch
Signed-off-by: Sana.Kazi <Sana.Kazi@kpit.com>
diff --git a/lib/http.c b/lib/http.c
index ce79fc4e31c8..f0476f3b9272 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -731,6 +731,21 @@
return CURLE_OK;
}
+/*
+ * allow_auth_to_host() tells if autentication, cookies or other "sensitive
+ * data" can (still) be sent to this host.
+ */
+static bool allow_auth_to_host(struct Curl_easy *data)
+{
+ struct connectdata *conn = data->conn;
+ return (!data->state.this_is_a_follow ||
+ data->set.allow_auth_to_other_hosts ||
+ (data->state.first_host &&
+ strcasecompare(data->state.first_host, conn->host.name) &&
+ (data->state.first_remote_port == conn->remote_port) &&
+ (data->state.first_remote_protocol == conn->handler->protocol)));
+}
+
/**
* Curl_http_output_auth() setups the authentication headers for the
* host/proxy and the correct authentication
@@ -799,15 +799,12 @@
with it */
authproxy->done = TRUE;
- /* To prevent the user+password to get sent to other than the original
- host due to a location-follow, we do some weirdo checks here */
- if(!data->state.this_is_a_follow ||
- conn->bits.netrc ||
- !data->state.first_host ||
- data->set.allow_auth_to_other_hosts ||
- strcasecompare(data->state.first_host, conn->host.name)) {
+ /* To prevent the user+password to get sent to other than the original host
+ due to a location-follow */
+ if(allow_auth_to_host(data)
+ || conn->bits.netrc
+ )
result = output_auth_headers(conn, authhost, request, path, FALSE);
- }
else
authhost->done = TRUE;
@@ -1879,10 +1891,7 @@
checkprefix("Cookie:", compare)) &&
/* be careful of sending this potentially sensitive header to
other hosts */
- (data->state.this_is_a_follow &&
- data->state.first_host &&
- !data->set.allow_auth_to_other_hosts &&
- !strcasecompare(data->state.first_host, conn->host.name)))
+ !allow_auth_to_host(data))
;
else {
result = Curl_add_bufferf(&req_buffer, "%s\r\n", compare);
@@ -2065,6 +2074,7 @@
return CURLE_OUT_OF_MEMORY;
data->state.first_remote_port = conn->remote_port;
+ data->state.first_remote_protocol = conn->handler->protocol;
}
if((conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_FTP)) &&
diff --git a/lib/urldata.h b/lib/urldata.h
index 1d89b8d7fa68..ef2174d9e727 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1342,13 +1342,15 @@
char *ulbuf; /* allocated upload buffer or NULL */
curl_off_t current_speed; /* the ProgressShow() function sets this,
bytes / second */
- char *first_host; /* host name of the first (not followed) request.
- if set, this should be the host name that we will
- sent authorization to, no else. Used to make Location:
- following not keep sending user+password... This is
- strdup() data.
- */
- int first_remote_port; /* remote port of the first (not followed) request */
+
+ /* host name, port number and protocol of the first (not followed) request.
+ if set, this should be the host name that we will sent authorization to,
+ no else. Used to make Location: following not keep sending user+password.
+ This is strdup()ed data. */
+ char *first_host;
+ int first_remote_port;
+ unsigned int first_remote_protocol;
+
struct curl_ssl_session *session; /* array of 'max_ssl_sessions' size */
long sessionage; /* number of the most recent session */
unsigned int tempcount; /* number of entries in use in tempwrite, 0 - 3 */
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