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CVE-2023-5824— Squid: dos against http and https

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Squid是一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 6.4之前版本存在安全漏洞，该漏洞源于结构元素错误处理不当，容易受到针对HTTP和HTTPS客户端的拒绝服务攻击。

CVSS 7.5 · High EPSS 5.19% · P92

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-5824

Vulnerability Information
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Vulnerability Title
Squid: dos against http and https
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Squid 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Squid是一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。 Squid 6.4之前版本存在安全漏洞，该漏洞源于结构元素错误处理不当，容易受到针对HTTP和HTTPS客户端的拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 8 8090020231130092412.a75119d5 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020240122164331.4cda2c84 ~ * cpe:/a:redhat:rhel_tus:8.2::appstream
Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service 8020020240122164331.4cda2c84 ~ * cpe:/a:redhat:rhel_tus:8.2::appstream
Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions 8020020240122164331.4cda2c84 ~ * cpe:/a:redhat:rhel_tus:8.2::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020240122165847.522a0ee4 ~ * cpe:/a:redhat:rhel_e4s:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 8040020240122165847.522a0ee4 ~ * cpe:/a:redhat:rhel_e4s:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 8040020240122165847.522a0ee4 ~ * cpe:/a:redhat:rhel_e4s:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 8060020231222131040.ad008a3a ~ * cpe:/a:redhat:rhel_eus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 8080020231222130009.63b34585 ~ * cpe:/a:redhat:rhel_eus:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 7:5.5-6.el9_3.2 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 7:5.2-1.el9_0.4 ~ * cpe:/a:redhat:rhel_eus:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 7:5.5-5.el9_2.3 ~ * cpe:/a:redhat:rhel_eus:9.2::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7

II. Public POCs for CVE-2023-5824

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8327 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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POC zip download
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III. Intelligence Information for CVE-2023-5824

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Vendor Advisories for CVE-2023-5824 (12)

Same Patch Batch · Red Hat · 2023-11-03 · 5 CVEs total

CVE-2023-3961 9.1 CRITICAL Samba: smbd allows client access to unix domain sockets on the file system as root
CVE-2023-1476 7.0 HIGH Kpatch: mm/mremap.c: incomplete fix for cve-2022-41222
CVE-2023-4091 6.5 MEDIUM Samba: smb clients can truncate files with read-only permissions
CVE-2023-5088 6.4 MEDIUM Qemu: improper ide controller reset can lead to mbr overwrite

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-755

V. Comments for CVE-2023-5824

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