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.
History

Wed, 21 Aug 2024 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Russh Project
Russh Project russh
CPEs cpe:2.3:a:russh_project:russh:*:*:*:*:*:rust:*:*
Vendors & Products Russh Project
Russh Project russh
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 21 Aug 2024 15:30:00 +0000

Type Values Removed Values Added
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.
Title Russh has an OOM Denial of Service due to allocation of untrusted amount
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2024-08-21T15:09:34.316Z

Updated: 2024-08-21T15:35:25.998Z

Reserved: 2024-08-12T18:02:04.967Z

Link: CVE-2024-43410

cve-icon Vulnrichment

Updated: 2024-08-21T15:35:19.570Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-08-21T16:15:08.373

Modified: 2024-08-21T17:25:08.560

Link: CVE-2024-43410

cve-icon Redhat

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