遠端 CentOS Linux 8 主機上安裝的套件受到 CESA-2021: 4292 公告中提及的多個弱點影響。

  - squid：URN 處理過程中的拒絕服務 (CVE-2021-28651)

  - squid：Cache Manager 中的拒絕服務 (CVE-2021-28652)

  - squid：HTTP 回應處理過程中的拒絕服務 (CVE-2021-28662、CVE-2021-33620)

  - squid：HTTP Range 標頭中的不當輸入驗證 (CVE-2021-31806)

  - squid：HTTP Range 標頭中的不正確記憶體管理 (CVE-2021-31807)

  - squid：HTTP Range 標頭中的整數溢位 (CVE-2021-31808)

請注意，Nessus 並未測試此問題，而是僅依據應用程式自我報告的版本號碼。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - 在版本低于 4.15 以及版本为低于 5.0.6 的 5.x 的 Squid 中发现问题。由于输入验证缺陷，它容易遭受拒绝服务攻击（针对使用代理的所有客户端）。客户端可发送 HTTP 范围请求，以触发此操作。(CVE-2021-31808)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

远程主机受到 GLSA-202105-14 中所述漏洞的影响（Squid：多个漏洞）

    已在 Squid 中发现多种漏洞。请检查下方引用的 CVE 标识符以了解详细信息。
  影响：

    远程攻击者可发送特别构建的请求，从而导致出现拒绝服务的情况或发生信息泄露。
  变通方案：

    目前无任何已知的变通方案。

远程 CentOS Linux 8 主机上安装的程序包受到 CESA-2021: 4292 公告中提及的多个漏洞影响。

  - squid：URN 处理过程中发生拒绝服务 (CVE-2021-28651)

  - squid：缓存管理器中存在拒绝服务问题 (CVE-2021-28652)

  - squid：HTTP 响应处理过程中发生拒绝服务（CVE-2021-28662、CVE-2021-33620）

  - squid：HTTP Range 标头中存在输入验证错误问题 (CVE-2021-31806)

  - squid：HTTP Range 标头中存在内存管理错误问题 (CVE-2021-31807)

  - squid：HTTP Range 标头中存在整数溢出问题 (CVE-2021-31808)

请注意，Nessus 尚未测试此问题，而是只依靠应用程序自我报告的版本号来判断。

远程 Rocky Linux 8 主机上存在安装的程序包该程序包受到公告 RLSA-2021:4292 中提及的多个漏洞的影响。

  - 在版本低于 4.15 以及版本为低于 5.0.6 的 5.x 的 Squid 中发现问题。由于缓冲区管理缺陷，它允许拒绝服务。用 urn: 方案解析请求时解析器会泄漏少量内存。但是，有一个不明攻击方法可以轻松触发大量内存消耗。(CVE-2021-28651)

  - 在版本低于 4.15 以及版本为低于 5.0.6 的 5.x 的 Squid 中发现问题。由于解析器验证错误，它允许对 Cache Manager API 发起拒绝服务攻击。这允许受信任的客户端通过不明短查询字符串触发内存泄漏，久而久之便可导致拒绝服务。此攻击仅限于具有 Cache Manager API 访问权限的客户端。(CVE-2021-28652)

  - 在 Squid 4.15 之前的 4.x 和 Squid 5.0.6 之前的 5.x 中发现问题。如果远程服务器通过 HTTP 或 HTTPS 发送某个响应标头，则存在拒绝服务。此标头可合理地出现在良好的网络流量中。(CVE-2021-28662)

  - 在版本低于 4.15 以及版本为低于 5.0.6 的 5.x 的 Squid 中发现问题。由于内存管理缺陷，此标头可通过 HTTP 范围请求处理，容易受到拒绝服务攻击（针对使用代理的所有客户端）。(CVE-2021-31806)

  - 在版本低于 4.15 以及版本为低于 5.0.6 的 5.x 的 Squid 中发现问题。向 HTTP 范围请求传递响应时，远程服务器可利用整数溢出问题，造成拒绝服务。无任何恶意且预期存在于 HTTP 流量中的标头可以触发此问题。
    (CVE-2021-31807)

  - 在版本低于 4.15 以及版本为低于 5.0.6 的 5.x 的 Squid 中发现问题。由于输入验证缺陷，它容易遭受拒绝服务攻击（针对使用代理的所有客户端）。客户端可发送 HTTP 范围请求，以触发此操作。(CVE-2021-31808)

  - 4.15 之前的 Squid 和 5.0.6 之前的 5.x 允许远程服务器通过 HTTP 响应导致服务（影响所有客户端的可用性）。问题触发因素为 HTTP 流量中预期存在的标头，服务器并无任何恶意。(CVE-2021-33620)

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4292 advisory.

    libecap     squid     [7:4.15-1]
    - new version 4.15
    - Resolves: #1964384 - squid:4 rebase to 4.15

    [7:4.11-5]
    - Resolves: #1944261 - CVE-2020-25097 squid:4/squid: improper input validation       may allow a trusted client to perform HTTP Request Smuggling

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0132 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-28116:
    Squid through 4.14 and 5.x through 5.0.5, in some configurations, allows information disclosure because of     an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code     execution as nobody.

    CVE-2021-28651:
    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption.

    CVE-2021-28652:
    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege.

    CVE-2021-28662:
    An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain     response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in     benign network traffic.

    CVE-2021-31806:
    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing.

    CVE-2021-31807:
    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.

    CVE-2021-31808:
    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this.

    CVE-2021-33620:
    Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server.

    CVE-2021-46784:
    In Squid 3.x through 3.5.28, 4.x through 4.17, and 5.x before 5.6, due to improper buffer management, a     Denial of Service can occur when processing long Gopher server responses.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of squid installed on the remote host is prior to 3.5.20-17. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-1950 advisory.

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it     allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount     of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of     memory consumption. (CVE-2021-28651)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to incorrect parser validation, it     allows a Denial of Service attack against the Cache Manager API. This allows a trusted client to trigger     memory leaks that. over time, lead to a Denial of Service via an unspecified short query string. This     attack is limited to clients with Cache Manager API access privilege. (CVE-2021-28652)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request     processing. (CVE-2021-31806)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. An integer overflow problem allows a     remote server to achieve Denial of Service when delivering responses to HTTP Range requests. The issue     trigger is a header that can be expected to exist in HTTP traffic without any malicious intent.
    (CVE-2021-31807)

    An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is     vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP     Range request to trigger this. (CVE-2021-31808)

    Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting     availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to     exist in HTTP traffic without any malicious intent by the server. (CVE-2021-33620)

    A flaw was found in squid. A trusted client can directly access the cache manager information, bypassing     the manager ACL protection and resulting in information disclosure. (CVE-2022-41317)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
155039	CentOS 8：squid：4 (CESA-2021: 4292)	Nessus	CentOS Local Security Checks	2021/11/11	2023/11/24	high
252911	Linux Distros 未修补的漏洞：CVE-2021-31808	Nessus	Misc.	2025/8/20	2025/8/20	medium
150021	GLSA-202105-14 ：Squid：多个漏洞	Nessus	Gentoo Local Security Checks	2021/5/27	2024/1/12	high
155039	CentOS 8：squid: 4 (CESA-2021: 4292)	Nessus	CentOS Local Security Checks	2021/11/11	2023/11/24	high
185083	Rocky Linux 8squid:4 (RLSA-2021:4292)	Nessus	Rocky Linux Local Security Checks	2023/11/7	2023/11/7	high
155429	Oracle Linux 8 : squid:4 (ELSA-2021-4292)	Nessus	Oracle Linux Local Security Checks	2021/11/17	2024/10/22	high
236478	Alibaba Cloud Linux 3 : 0132: squid:4 (ALINUX3-SA-2022:0132)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	medium
171805	Amazon Linux 2 : squid (ALAS-2023-1950)	Nessus	Amazon Linux Local Security Checks	2023/2/22	2024/12/11	medium

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