CVE-2023-34455 snappy-java's unchecked chunk length leads to DoS
Attackers can cause denial of service in snappy-java by providing crafted input that triggers memory exhaustion or fatal errors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-34455?
CVE-2023-34455 is a high-severity denial of service vulnerability in xerial snappy-java, published on 15 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
snappy-java is a fast compressor/decompressor for Java. Due to use of an unchecked chunk length, an unrecoverable fatal error can occur in versions prior to 1.1.10.1.
The code in the function hasNextChunk in the fileSnappyInputStream.java checks if a given stream has more chunks to read. It does that by attempting to read 4 bytes. If it wasn’t possible to read the 4 bytes, the function returns false. Otherwise, if 4 bytes were available, the code treats them as the length of the next chunk.
In the case that the `compressed` variable is null, a byte array is allocated with the size given by the input data. Since the code doesn’t test the legality of the `chunkSize` variable, it is possible to pass 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), which would raise the fatal `java.lang.OutOfMemoryError` error.
Version 1.1.10.1 contains a patch for this issue.
Weakness: CWE-770
Which versions are affected by CVE-2023-34455?
2 open source packages ship an affected version, including org.xerial.snappy:snappy-java. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.xerial.snappy:snappy-java Maven | All versions | 1.1.10.1 |
org.xerial.snappy:snappy-java Maven | All versions | 1.1.10.1 |
Products include Xerial Snappy-Java.
How do I fix CVE-2023-34455?
Upgrade org.xerial.snappy:snappy-java to 1.1.10.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-34455 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-34455 exists.
Other vulnerabilities in xerial snappy-java
Sources
Also known as CLEANSTART-2026-EQ18594, CLEANSTART-2026-NF97510, CLSA-2026-1774743847, ECHO-49bc-da78-64e7, GHSA-qcwq-55hx-v3vh, ROOT-APP-MAVEN-CVE-2023-34455 and 1 more.