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From: Markus Koschany <apo@debian.org>
Date: Wed, 28 Dec 2022 13:36:54 +0100
Subject: CVE-2021-37533
Bug-Debian: https://bugs.debian.org/1025910
Origin: https://github.com/apache/commons-net/commit/b0bff89f70cfea70009e22f87639816cc3993974
---
.../java/org/apache/commons/net/ftp/FTPClient.java | 91 ++++++++++++++++++----
.../org/apache/commons/net/ftp/FTPClientTest.java | 41 +++++++---
2 files changed, 106 insertions(+), 26 deletions(-)
diff --git a/src/main/java/org/apache/commons/net/ftp/FTPClient.java b/src/main/java/org/apache/commons/net/ftp/FTPClient.java
index bec47d1..16d969b 100644
--- a/src/main/java/org/apache/commons/net/ftp/FTPClient.java
+++ b/src/main/java/org/apache/commons/net/ftp/FTPClient.java
@@ -307,6 +307,18 @@ implements Configurable
*/
public static final String FTP_SYSTEM_TYPE_DEFAULT = "org.apache.commons.net.ftp.systemType.default";
+ /**
+ * The system property that defines the default for {@link #isIpAddressFromPasvResponse()}. This property, if present, configures the default for the
+ * following: If the client receives the servers response for a PASV request, then that response will contain an IP address. If this property is true, then
+ * the client will use that IP address, as requested by the server. This is compatible to version {@code 3.8.0}, and before. If this property is false, or
+ * absent, then the client will ignore that IP address, and instead use the remote address of the control connection.
+ *
+ * @see #isIpAddressFromPasvResponse()
+ * @see #setIpAddressFromPasvResponse(boolean)
+ * @since 3.9.0
+ */
+ public static final String FTP_IP_ADDRESS_FROM_PASV_RESPONSE = "org.apache.commons.net.ftp.ipAddressFromPasvResponse";
+
/**
* The name of an optional systemType properties file ({@value}), which is loaded
* using {@link Class#getResourceAsStream(String)}.<br>
@@ -506,6 +518,8 @@ implements Configurable
__featuresMap = null;
}
+ private boolean ipAddressFromPasvResponse = Boolean.parseBoolean(System.getProperty(FTPClient.FTP_IP_ADDRESS_FROM_PASV_RESPONSE));
+
/**
* Parse the pathname from a CWD reply.
* <p>
@@ -565,37 +579,43 @@ implements Configurable
{
java.util.regex.Matcher m = __PARMS_PAT.matcher(reply);
if (!m.find()) {
- throw new MalformedServerReplyException(
- "Could not parse passive host information.\nServer Reply: " + reply);
+ throw new MalformedServerReplyException("Could not parse passive host information.\nServer Reply: " + reply);
}
- __passiveHost = m.group(1).replace(',', '.'); // Fix up to look like IP address
+ int pasvPort;
+ // Fix up to look like IP address
+ String pasvHost = "0,0,0,0".equals(m.group(1)) ? _socket_.getInetAddress().getHostAddress() : m.group(1).replace(',', '.');
try
{
int oct1 = Integer.parseInt(m.group(2));
int oct2 = Integer.parseInt(m.group(3));
- __passivePort = (oct1 << 8) | oct2;
+ pasvPort = (oct1 << 8) | oct2;
}
catch (NumberFormatException e)
{
- throw new MalformedServerReplyException(
- "Could not parse passive port information.\nServer Reply: " + reply);
+ throw new MalformedServerReplyException("Could not parse passive port information.\nServer Reply: " + reply);
}
-
- if (__passiveNatWorkaroundStrategy != null) {
- try {
- String passiveHost = __passiveNatWorkaroundStrategy.resolve(__passiveHost);
- if (!__passiveHost.equals(passiveHost)) {
- fireReplyReceived(0,
- "[Replacing PASV mode reply address "+__passiveHost+" with "+passiveHost+"]\n");
- __passiveHost = passiveHost;
+ if (isIpAddressFromPasvResponse()) {
+ // Pre-3.9.0 behavior
+ if (__passiveNatWorkaroundStrategy != null) {
+ try {
+ final String newPassiveHost = __passiveNatWorkaroundStrategy.resolve(pasvHost);
+ if (!pasvHost.equals(newPassiveHost)) {
+ fireReplyReceived(0, "[Replacing PASV mode reply address " + __passiveHost + " with " + newPassiveHost + "]\n");
+ pasvHost = newPassiveHost;
+ }
+ } catch (final UnknownHostException e) { // Should not happen as we are passing in an IP address
+ throw new MalformedServerReplyException("Could not parse passive host information.\nServer Reply: " + reply);
}
- } catch (UnknownHostException e) { // Should not happen as we are passing in an IP address
- throw new MalformedServerReplyException(
- "Could not parse passive host information.\nServer Reply: " + reply);
}
+ } else if (_socket_ == null) {
+ pasvHost = null; // For unit testing.
+ } else {
+ pasvHost = _socket_.getInetAddress().getHostAddress();
}
+ __passiveHost = pasvHost;
+ __passivePort = pasvPort;
}
protected void _parseExtendedPassiveModeReply(String reply)
@@ -3968,6 +3988,43 @@ implements Configurable
}
return __systemName;
}
+
+ /**
+ * Returns, whether the IP address from the server's response should be used.
+ * Until 3.9.0, this has always been the case. Beginning with 3.9.0,
+ * that IP address will be silently ignored, and replaced with the remote
+ * IP address of the control connection, unless this configuration option is
+ * given, which restores the old behavior. To enable this by default, use
+ * the system property {@link FTPClient#FTP_IP_ADDRESS_FROM_PASV_RESPONSE}.
+ * @return True, if the IP address from the server's response will be used
+ * (pre-3.9 compatible behavior), or false (ignore that IP address).
+ *
+ * @see FTPClient#FTP_IP_ADDRESS_FROM_PASV_RESPONSE
+ * @see #setIpAddressFromPasvResponse(boolean)
+ * @since 3.9.0
+ */
+ public boolean isIpAddressFromPasvResponse() {
+ return ipAddressFromPasvResponse;
+ }
+
+ /**
+ * Sets whether the IP address from the server's response should be used.
+ * Until 3.9.0, this has always been the case. Beginning with 3.9.0,
+ * that IP address will be silently ignored, and replaced with the remote
+ * IP address of the control connection, unless this configuration option is
+ * given, which restores the old behavior. To enable this by default, use
+ * the system property {@link FTPClient#FTP_IP_ADDRESS_FROM_PASV_RESPONSE}.
+ *
+ * @param usingIpAddressFromPasvResponse True, if the IP address from the
+ * server's response should be used (pre-3.9.0 compatible behavior), or
+ * false (ignore that IP address).
+ * @see FTPClient#FTP_IP_ADDRESS_FROM_PASV_RESPONSE
+ * @see #isIpAddressFromPasvResponse
+ * @since 3.9.0
+ */
+ public void setIpAddressFromPasvResponse(boolean usingIpAddressFromPasvResponse) {
+ this.ipAddressFromPasvResponse = usingIpAddressFromPasvResponse;
+ }
}
/* Emacs configuration
diff --git a/src/test/java/org/apache/commons/net/ftp/FTPClientTest.java b/src/test/java/org/apache/commons/net/ftp/FTPClientTest.java
index e43f075..faac5bd 100644
--- a/src/test/java/org/apache/commons/net/ftp/FTPClientTest.java
+++ b/src/test/java/org/apache/commons/net/ftp/FTPClientTest.java
@@ -147,56 +147,79 @@ public class FTPClientTest extends TestCase {
public void testParsePassiveModeReplyForLocalAddressWithNatWorkaround() throws Exception {
FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
+ client.setIpAddressFromPasvResponse(true);
client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
assertEquals("8.8.8.8", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
+ assertNull(client.getPassiveHost());
}
public void testParsePassiveModeReplyForNonLocalAddressWithNatWorkaround() throws Exception {
FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
+ client.setIpAddressFromPasvResponse(true);
client._parsePassiveModeReply("227 Entering Passive Mode (8,8,4,4,192,22).");
assertEquals("8.8.4.4", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (8,8,4,4,192,22).");
+ assertNull(client.getPassiveHost());
}
@SuppressWarnings("deprecation") // testing deprecated code
public void testParsePassiveModeReplyForLocalAddressWithNatWorkaroundDisabled() throws Exception {
FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
client.setPassiveNatWorkaround(false);
+ client.setIpAddressFromPasvResponse(true);
client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
assertEquals("172.16.204.138", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
+ assertNull(client.getPassiveHost());
}
@SuppressWarnings("deprecation") // testing deprecated code
public void testParsePassiveModeReplyForNonLocalAddressWithNatWorkaroundDisabled() throws Exception {
FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
+ client.setIpAddressFromPasvResponse(true);
client.setPassiveNatWorkaround(false);
client._parsePassiveModeReply("227 Entering Passive Mode (8,8,4,4,192,22).");
assertEquals("8.8.4.4", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (8,8,4,4,192,22).");
+ assertNull(client.getPassiveHost());
}
public void testParsePassiveModeReplyForLocalAddressWithoutNatWorkaroundStrategy() throws Exception {
FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
client.setPassiveNatWorkaroundStrategy(null);
+ client.setIpAddressFromPasvResponse(true);
client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
assertEquals("172.16.204.138", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
+ assertNull(client.getPassiveHost());
}
public void testParsePassiveModeReplyForNonLocalAddressWithoutNatWorkaroundStrategy() throws Exception {
FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
+ client.setIpAddressFromPasvResponse(true);
client.setPassiveNatWorkaroundStrategy(null);
client._parsePassiveModeReply("227 Entering Passive Mode (8,8,4,4,192,22).");
assertEquals("8.8.4.4", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (8,8,4,4,192,22).");
+ assertNull(client.getPassiveHost());
}
public void testParsePassiveModeReplyForLocalAddressWithSimpleNatWorkaroundStrategy() throws Exception {
- FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
- client.setPassiveNatWorkaroundStrategy(new FTPClient.HostnameResolver() {
- @Override
- public String resolve(String hostname) throws UnknownHostException {
- return "4.4.4.4";
- }
-
- });
+ final FTPClient client = new PassiveNatWorkAroundLocalClient("8.8.8.8");
+ client.setPassiveNatWorkaroundStrategy(hostname -> "4.4.4.4");
+ client.setIpAddressFromPasvResponse(true);
client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
assertEquals("4.4.4.4", client.getPassiveHost());
+ client.setIpAddressFromPasvResponse(false);
+ client._parsePassiveModeReply("227 Entering Passive Mode (172,16,204,138,192,22).");
+ assertNull(client.getPassiveHost());
}
- }
+
+}
|
