CVE-2024-43410: russh DoS — Exploit & Fix

Description

Russh is a Rust SSH client & server library. Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server. An SSH packet consists of a 4-byte big-endian length, followed by a byte stream of this length. After parsing and potentially decrypting the 4-byte length, russh allocates enough memory for this bytestream, as a performance optimization to avoid reallocations later. But this length is entirely untrusted and can be set to any value by the client, causing this much memory to be allocated, which will cause the process to OOM within a few such requests. This vulnerability is fixed in 0.44.1.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
russh_project	russh	< 0.44.1
warpgate_project	warpgate	< 0.10.2

References

Advisories & Patches

https://github.com/Eugeny/russh/commit/f660ea3f64b86d11d19e33076012069f02431e55 https://github.com/Eugeny/russh/security/advisories/GHSA-vgvv-x7xg-6cqg

Exploits

https://github.com/Eugeny/russh/security/advisories/GHSA-vgvv-x7xg-6cqg

Frequently Asked Questions

What is CVE-2024-43410? +

Russh is a Rust SSH client & server library. Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server. An SSH packet consists of a 4-byte big-endian length, followed by a byte stream of this length. After parsing and potentially decrypting the 4-byte length, russh allocates enough memory for this bytestream, as a performance optimization to avoid reallocations later. But this length is entirely untrusted and can be set to any value by the client, causing this much memory to be allocated, which will cause the process to OOM within a few such requests. This vulnerability is fixed in 0.44.1. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-43410? +

CVE-2024-43410 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-43410? +

CVE-2024-43410 affects products from russh_project, warpgate_project, specifically: russh, warpgate. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-43410? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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