RHSA-2021:4292 - Security Advisory

Topic

An update for the squid: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

Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.

The following packages have been upgraded to a later upstream version: squid (4.15). (BZ#1964384)

Security Fix(es):

• squid: denial of service in URN processing (CVE-2021-28651)
• squid: denial of service issue in Cache Manager (CVE-2021-28652)
• squid: denial of service in HTTP response processing (CVE-2021-28662)
• squid: improper input validation in HTTP Range header (CVE-2021-31806)
• squid: incorrect memory management in HTTP Range header (CVE-2021-31807)
• squid: integer overflow in HTTP Range header (CVE-2021-31808)
• squid: denial of service in HTTP response processing (CVE-2021-33620)

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 8.5 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 this update, the squid service 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 8.8 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 8.8 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 8.8 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.8 x86_64
• 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 8.8 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 8.8 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.8 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.6 x86_64

Fixes

• BZ - 1959537 - CVE-2021-33620 squid: denial of service in HTTP response processing
• BZ - 1962243 - CVE-2021-28651 squid: denial of service in URN processing
• BZ - 1962246 - CVE-2021-28652 squid: denial of service issue in Cache Manager
• BZ - 1962254 - CVE-2021-28662 squid: denial of service in HTTP response processing
• BZ - 1962595 - CVE-2021-31806 squid: improper input validation in HTTP Range header
• BZ - 1962597 - CVE-2021-31807 squid: incorrect memory management in HTTP Range header
• BZ - 1962599 - CVE-2021-31808 squid: integer overflow in HTTP Range header

CVEs

• CVE-2021-28651
• CVE-2021-28652
• CVE-2021-28662
• CVE-2021-31806
• CVE-2021-31807
• CVE-2021-31808
• CVE-2021-33620

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/