Russh has an OOM Denial of Service due to allocation of untrusted amount

Summary Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server. Details 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...

russh may use insecure Diffie-Hellman keys

Summary Diffie-Hellman key validation is insufficient, which can lead to insecure shared secrets and therefore breaks confidentiality. Details Russh does not validate Diffie-Hellman keys. It accepts received DH public keys $e$ where $eDH Public Key values MUST be checked and both conditions: - $1...

A deep-dive into the SolarWinds Serv-U SSH vulnerability

Several weeks ago, Microsoft detected a 0-day remote code execution exploit being used to attack the SolarWinds Serv-U FTP software in limited and targeted attacks. The Microsoft Threat Intelligence Center MSTIC attributed the attack with high confidence to DEV-0322, a group operating out of Chin...

SSH Weak Algorithms Supported

Nessus has detected that the remote SSH server is configured to use the Arcfour stream cipher or no cipher at all. RFC 4253 advises against using Arcfour due to an issue with weak keys. C Tenable Network Security, Inc. include"compat.inc"; if description scriptid90317; scriptversion"1.4";...

Debian DLA-173-1 : putty security update

MATTA-2015-002 Florent Daigniere discovered that PuTTY did not enforce an acceptable range for the Diffie-Hellman server value, as required by RFC 4253, potentially allowing an eavesdroppable connection to be established in the event of a server weakness. 779488 CVE-2015-2157 Patrick Coleman...

[SECURITY] [DLA 173-1] putty security update

Package : putty Version : 0.60+2010-02-20-1+squeeze3 CVE ID : CVE-2015-2157 Debian Bug : 779488 MATTA-2015-002 Florent Daigniere discovered that PuTTY did not enforce an acceptable range for the Diffie-Hellman server value, as required by RFC 4253, potentially allowing an eavesdroppable connectio...