From 40035dc59c33fdf32d716b0804495104c54b5105 Mon Sep 17 00:00:00 2001
From: terrafrost <terrafrost@gmail.com>
Date: Thu, 11 Nov 2021 19:50:52 -0600
Subject: [PATCH] SFTP: don't attempt to parse unsupported attributes

---
 phpseclib/Net/SFTP.php | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 7efead76..50c4b47a 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -3254,6 +3254,36 @@ class Net_SFTP extends Net_SSH2
             $attr['type'] = $type;
         }
         foreach ($this->attributes as $key => $value) {
+            switch ($flags & $key) {
+                case NET_SFTP_ATTR_UIDGID:
+                    if ($this->version > 3) {
+                        continue 2;
+                    }
+                    break;
+                case NET_SFTP_ATTR_CREATETIME:
+                case NET_SFTP_ATTR_MODIFYTIME:
+                case NET_SFTP_ATTR_ACL:
+                case NET_SFTP_ATTR_OWNERGROUP:
+                case NET_SFTP_ATTR_SUBSECOND_TIMES:
+                    if ($this->version < 4) {
+                        continue 2;
+                    }
+                    break;
+                case NET_SFTP_ATTR_BITS:
+                    if ($this->version < 5) {
+                        continue 2;
+                    }
+                    break;
+                case NET_SFTP_ATTR_ALLOCATION_SIZE:
+                case NET_SFTP_ATTR_TEXT_HINT:
+                case NET_SFTP_ATTR_MIME_TYPE:
+                case NET_SFTP_ATTR_LINK_COUNT:
+                case NET_SFTP_ATTR_UNTRANSLATED_NAME:
+                case NET_SFTP_ATTR_CTIME:
+                    if ($this->version < 6) {
+                        continue 2;
+                    }
+            }
             switch ($flags & $key) {
                 case NET_SFTP_ATTR_SIZE:             // 0x00000001
                     // The size attribute is defined as an unsigned 64-bit integer.