CVE-2025-25193: Denial of Service attack on windows app using Netty
First published: Mon Feb 10 2025(Updated: )
### Summary An unsafe reading of environment file could potentially cause a denial of service in Netty. When loaded on an Windows application, Netty attemps to load a file that does not exist. If an attacker creates such a large file, the Netty application crash. ### Details A similar issue was previously reported in https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv This issue was fixed, but the fix was incomplete in that null-bytes were not counted against the input limit. ### PoC The PoC is the same as for https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv with the detail that the file should only contain null-bytes; 0x00. When the null-bytes are encountered by the `InputStreamReader`, it will issue replacement characters in its charset decoding, which will fill up the line-buffer in the `BufferedReader.readLine()`, because the replacement character is not a line-break character. ### Impact Impact is the same as https://github.com/netty/netty/security/advisories/GHSA-xq3w-v528-46rv
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| maven/io.netty:netty-common | <4.1.118.Final | 4.1.118.Final |
| NettyRPC | <4.1.118 |
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Reference Links
- https://github.com/netty/netty/security/advisories/GHSA-389x-839f-4rhx
- https://github.com/netty/netty/commit/d1fbda62d3a47835d3fb35db8bd42ecc205a5386
- https://nvd.nist.gov/vuln/detail/CVE-2025-25193
- https://security.netapp.com/advisory/ntap-20250221-0006
- https://github.com/advisories/GHSA-389x-839f-4rhx (Advisory)
- https://security.netapp.com/advisory/ntap-20250221-0006/
- https://access.redhat.com/security/cve/CVE-2024-47535
- https://access.redhat.com/errata/RHSA-2025:3357
- https://access.redhat.com/errata/RHSA-2025:3358
- https://bugzilla.redhat.com/show_bug.cgi?id=2344788
Frequently Asked Questions
What is the severity of CVE-2025-25193?
CVE-2025-25193 is categorized as a critical vulnerability due to its potential to cause denial of service.
How do I fix CVE-2025-25193?
To resolve CVE-2025-25193, upgrade to Netty version 4.1.119 or later.
Which versions of Netty are affected by CVE-2025-25193?
CVE-2025-25193 affects Netty versions up to and including 4.1.118.
What are the consequences of exploiting CVE-2025-25193?
Exploiting CVE-2025-25193 can lead to application crashes and unavailability due to denial of service.
Is CVE-2025-25193 applicable to Windows applications only?
Yes, CVE-2025-25193 specifically affects Netty running on Windows applications.
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