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CVE-2024-43410

Russh denial of service

7.5 HIGHPublic exploitEPSS 0.91%
  1. Published21 Aug 2024

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Russh< 0.44.1
Warpgate< 0.10.2

Remediation

Fixed in
Russh≥ 0.44.1
Warpgate≥ 0.10.2

References

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Frequently asked

Is CVE-2024-43410 being actively exploited?

CVE-2024-43410 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.91%.

How severe is CVE-2024-43410?

CVE-2024-43410 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.91% probability of exploitation.

Which products are affected by CVE-2024-43410?

Affected products include Russh, Warpgate.

How do I fix CVE-2024-43410?

Upgrade affected software to a fixed version, for example Russh 0.44.1, Warpgate 0.10.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.