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From 5cea97e083448aaa2352320612541c895178b3b5 Mon Sep 17 00:00:00 2001
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From: "Christoph M. Becker" <cmbecker69@gmx.de>
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Date: Mon, 14 Jun 2021 13:22:27 +0200
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Subject: [PATCH] Fix #81122: SSRF bypass in FILTER_VALIDATE_URL
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We need to ensure that the password detected by parse_url() is actually
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a valid password; we can re-use is_userinfo_valid() for that.
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---
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ext/filter/logical_filters.c | 4 +++-
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ext/filter/tests/bug81122.phpt | 21 +++++++++++++++++++++
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2 files changed, 24 insertions(+), 1 deletion(-)
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create mode 100644 ext/filter/tests/bug81122.phpt
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diff --git a/ext/filter/logical_filters.c b/ext/filter/logical_filters.c
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index ba2e7e527e76..721da45d532d 100644
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--- a/ext/filter/logical_filters.c
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+++ b/ext/filter/logical_filters.c
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@@ -632,7 +632,9 @@ void php_filter_validate_url(PHP_INPUT_FILTER_PARAM_DECL) /* {{{ */
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RETURN_VALIDATION_FAILED
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}
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- if (url->user != NULL && !is_userinfo_valid(url->user)) {
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+ if (url->user != NULL && !is_userinfo_valid(url->user)
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+ || url->pass != NULL && !is_userinfo_valid(url->pass)
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+ ) {
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php_url_free(url);
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RETURN_VALIDATION_FAILED
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diff --git a/ext/filter/tests/bug81122.phpt b/ext/filter/tests/bug81122.phpt
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new file mode 100644
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index 000000000000..d89d4114a547
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--- /dev/null
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+++ b/ext/filter/tests/bug81122.phpt
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@@ -0,0 +1,21 @@
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+--TEST--
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+Bug #81122 (SSRF bypass in FILTER_VALIDATE_URL)
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+--SKIPIF--
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+
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+if (!extension_loaded('filter')) die("skip filter extension not available");
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+?>
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+--FILE--
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+
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+$urls = [
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+ "https://example.com:\\@test.com/",
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+ "https://user:\\epass@test.com",
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+ "https://user:\\@test.com",
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+];
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+foreach ($urls as $url) {
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+ var_dump(filter_var($url, FILTER_VALIDATE_URL));
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+}
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+?>
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+--EXPECT--
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+bool(false)
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+bool(false)
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+bool(false)
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