Moderate: httpd:2.4 security and bug fix update

Topic

An update for the httpd:2.4 module is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Request splitting via HTTP/2 method injection and mod_proxy (CVE-2021-33193)
• httpd: mod_proxy_uwsgi: out-of-bounds read via a crafted request uri-path (CVE-2021-36160)
• httpd: possible NULL dereference or SSRF in forward proxy configurations (CVE-2021-44224)
• httpd: Single zero byte stack overflow in mod_auth_digest (CVE-2020-35452)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the updated packages, the httpd daemon will be restarted automatically.

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.6 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.6 x86_64
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.6 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions 8.6 x86_64

Fixes

• BZ - 1966724 - CVE-2020-35452 httpd: Single zero byte stack overflow in mod_auth_digest
• BZ - 1966728 - CVE-2021-33193 httpd: Request splitting via HTTP/2 method injection and mod_proxy
• BZ - 1984828 - mod_proxy_hcheck piles up health checks leading to high memory consumption
• BZ - 2001046 - Apache httpd OOME with mod_dav in RHEL 8
• BZ - 2005124 - CVE-2021-36160 httpd: mod_proxy_uwsgi: out-of-bounds read via a crafted request uri-path
• BZ - 2034672 - CVE-2021-44224 httpd: possible NULL dereference or SSRF in forward proxy configurations

CVEs

• CVE-2020-35452
• CVE-2021-33193
• CVE-2021-36160
• CVE-2021-44224

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.6_release_notes/