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squid

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.

CVE-2023-5824 is a vulnerability identified in the Squid caching proxy component included with Red Hat Enterprise Linux 8. Squid enforces limits on the size of HTTP response headers during initial validation before caching them. However, when these headers are retrieved from the disk cache, they may grow beyond the configured maximum size due to improper handling of exceptional conditions. This unchecked growth can cause the Squid worker process to stall or crash, leading to a denial of service condition. The vulnerability does not impact confidentiality or integrity but severely affects availability. It can be exploited remotely over the network without any authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The flaw stems from inadequate validation logic applied only at the time of caching, not during retrieval, allowing maliciously crafted HTTP responses with large headers to trigger the issue. Although no known exploits are reported in the wild, the high CVSS score of 7.5 reflects the ease of exploitation and the significant impact on service availability. This vulnerability is particularly relevant for organizations using Squid as a caching proxy in Red Hat Enterprise Linux 8 environments, where denial of service could disrupt critical web services or internal network operations.

Detailed information about CVE-2023-5824: Improper Handling of Exceptional Conditions in Red Hat Red Hat Enterprise Linux 8 affecting Red Hat Red Hat Enterprise

CVE-2023-5824: Improper Handling of Exceptional Conditions in Red Hat Red Hat Enterprise Linux 8 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-5824: Improper Handling of Exceptional Conditions in Red Hat Red Hat Enterprise Linux 8

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