CVE-2023-5824

Squid: dos against http and https

Description

A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.

Remediation

Workaround:

  • Disabling the disk caching mechanism will mitigate this vulnerability. To achieve this, remove all the 'cache_dir' directives from the Squid configuration, typically in the /etc/squid/squid.conf file.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.97% Top 25%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory github.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2023:7465 vendor advisory
https://access.redhat.com/errata/RHSA-2023:7668 vendor advisory
https://access.redhat.com/errata/RHSA-2024:0072 vendor advisory
https://access.redhat.com/errata/RHSA-2024:0397 vendor advisory
https://access.redhat.com/errata/RHSA-2024:0771 vendor advisory
https://access.redhat.com/errata/RHSA-2024:0772 vendor advisory
https://access.redhat.com/errata/RHSA-2024:0773 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1153 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-5824 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2245914 issue tracking
https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255 vendor advisory
https://security.netapp.com/advisory/ntap-20231130-0003/

Frequently Asked Questions

What is the severity of CVE-2023-5824?
CVE-2023-5824 has been scored as a high severity vulnerability.
How to fix CVE-2023-5824?
As a workaround for remediating CVE-2023-5824: Disabling the disk caching mechanism will mitigate this vulnerability. To achieve this, remove all the 'cache_dir' directives from the Squid configuration, typically in the /etc/squid/squid.conf file.
Is CVE-2023-5824 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-5824 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-5824?
CVE-2023-5824 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7.
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