CVE-2024-43410: eugeny russh

Vulnerability summary

CVE-2024-43410 is a high (CVSS 7.5) vulnerability in eugeny russh. EPSS estimates a 0.91% chance of exploitation in the next 30 days, higher than 59.4% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 21-08-2024
   PublishedVulnerability first disclosed.
2. 21-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.