SB2021052204 - Red Hat Enterprise Linux 8 update for the httpd:2.4 module

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Security restrictions bypass (CVE-ID: CVE-2018-17199)

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to mod_session checks the session expiry time before decoding the session. A remote attacker сan cause session expiry time to be ignored for mod_session_cookie sessions since the expiry time is loaded when the session is decoded and reuse old session credentials or session IDs, which the attacker could use to access web pages previously accessed by a targeted user. 

2) Buffer overflow (CVE-ID: CVE-2020-11984)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in od_proxy_uwsgi module. A remote attacker can send a specially crafted request to the web server, trigger memory corruption and gain access to sensitive information or execute arbitrary code on the target system.

3) Resource management error (CVE-ID: CVE-2020-11993)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the application while processing HTTP/2 requests with enabled trace/debug for HTTP/2 connections. A remote attacker can send specially crafted HTTP/2 requests to Apache HTTP Server and force it to make logging statements on wrong connection for certain traffic edge patterns. This results in concurrent use of memory pools for separate connections and triggers denial of service condition.

Remediation

Install update from vendor's website.

References

• https://access.redhat.com/errata/RHSA-2021:1809