Denial of Service (DoS) Affecting golang.org/x/crypto/ssh package, versions <0.0.0-20211202192323-5770296d904e
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Test your applications- Snyk ID SNYK-GOLANG-GOLANGORGXCRYPTOSSH-3026972
- published 18 Sep 2022
- disclosed 7 Sep 2022
- credit Rod Hynes, Psiphon Inc
Introduced: 7 Sep 2022
CVE-2021-43565 Open this link in a new tabHow to fix?
Upgrade golang.org/x/crypto/ssh to version 0.0.0-20211202192323-5770296d904e or higher.
Overview
golang.org/x/crypto/ssh is a SSH client and server
Affected versions of this package are vulnerable to Denial of Service (DoS) via the SSH server, when processing malformed GCM and ChaChaPoly1305 packets that contains empty plaintext.
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
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