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From 76a8b07ed74add68c52ed1a5399416ff267cef88 Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Tue, 17 Dec 2019 10:53:47 +0100
Subject: [PATCH] Fix #78862: link() silently truncates after a null byte on
Windows
Since link() is supposed to accepts paths (i.e. strings without NUL
bytes), we must not accept arbitrary strings.
(cherry picked from commit 0e6c0654ed06751ced134515f7629c40bd979d7f)
---
NEWS | 4 ++++
ext/standard/link_win32.c | 2 +-
.../tests/file/windows_links/bug78862.phpt | 17 +++++++++++++++++
3 files changed, 22 insertions(+), 1 deletion(-)
create mode 100644 ext/standard/tests/file/windows_links/bug78862.phpt
diff --git a/NEWS b/NEWS
index 29fcce8947..02cd502c8c 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,10 @@ Backported from 7.2.26
. Fixed bug #78878 (Buffer underflow in bc_shift_addsub). (CVE-2019-11046).
(cmb)
+- Core:
+ . Fixed bug #78862 (link() silently truncates after a null byte on Windows).
+ (CVE-2019-11044). (cmb)
+
Backported from 7.1.33
- FPM:
diff --git a/ext/standard/link_win32.c b/ext/standard/link_win32.c
index 0068a3edb1..c6133c7ef6 100644
--- a/ext/standard/link_win32.c
+++ b/ext/standard/link_win32.c
@@ -208,7 +208,7 @@ PHP_FUNCTION(link)
/*First argument to link function is the target and hence should go to frompath
Second argument to link function is the link itself and hence should go to topath */
- if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss", &frompath, &frompath_len, &topath, &topath_len) == FAILURE) {
+ if (zend_parse_parameters(ZEND_NUM_ARGS(), "pp", &frompath, &frompath_len, &topath, &topath_len) == FAILURE) {
return;
}
diff --git a/ext/standard/tests/file/windows_links/bug78862.phpt b/ext/standard/tests/file/windows_links/bug78862.phpt
new file mode 100644
index 0000000000..33b4b49293
--- /dev/null
+++ b/ext/standard/tests/file/windows_links/bug78862.phpt
@@ -0,0 +1,17 @@
+--TEST--
+Bug #78862 (link() silently truncates after a null byte on Windows)
+--FILE--
+<?php
+file_put_contents(__DIR__ . '/bug78862.target', 'foo');
+var_dump(link(__DIR__ . "/bug78862.target\0more", __DIR__ . "/bug78862.link\0more"));
+var_dump(file_exists(__DIR__ . '/bug78862.link'));
+?>
+--EXPECTF--
+Warning: link() expects parameter 1 to be a valid path, string given in %s on line %d
+NULL
+bool(false)
+--CLEAN--
+<?php
+unlink(__DIR__ . '/bug78862.target');
+unlink(__DIR__ . '/bug78862.link');
+?>
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