var-202107-1672
Vulnerability from variot

ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim's traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer. F5 Networks of nginx Products from other vendors contain vulnerabilities related to certificate validation.Information may be obtained and information may be tampered with. (CVE-2020-11724). ========================================================================== Ubuntu Security Notice USN-5371-2 April 28, 2022

nginx vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 22.04 LTS

Summary:

nginx could be made to redirect network traffic.

Software Description: - nginx: small, powerful, scalable web/proxy server

Details:

USN-5371-1 fixed several vulnerabilities in nginx. This update provides the fix for CVE-2021-3618 for Ubuntu 22.04 LTS.

Original advisory details:

It was discovered that nginx Lua module mishandled certain inputs. An attacker could possibly use this issue to perform an HTTP Request Smuggling attack. This issue only affects Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-11724)

It was discovered that nginx Lua module mishandled certain inputs. An attacker could possibly use this issue to disclose sensitive information. This issue only affects Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-36309)

It was discovered that nginx mishandled the use of compatible certificates among multiple encryption protocols. (CVE-2021-3618)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.04 LTS: nginx-core 1.18.0-6ubuntu14.1 nginx-extras 1.18.0-6ubuntu14.1 nginx-light 1.18.0-6ubuntu14.1

In general, a standard system update will make all the necessary changes.

References: https://ubuntu.com/security/notices/USN-5371-2 https://ubuntu.com/security/notices/USN-5371-1 CVE-2021-3618

Package Information: https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.1

Show details on source website


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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