The version of squid installed on the remote host is prior to 3.5.20-17.44. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1687 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.

远程 Oracle Linux 8 主机上安装的程序包受到 ELSA-2021-4292 公告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。使用 urn: scheme 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 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)

  - 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)

  - 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。

远程主机上安装的 squid 版本低于 3.5.20-17。因此，它受到 ALAS2-2023-1950 公告中提及的多个漏洞影响。

  - 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。使用 urn: scheme 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)

  - 在 Squid 4.9 至 4.17 及 5.0.6 至 5.6 版本中发现问题。由于对内部 URI 的处理不一致，通过向内部缓存管理器 URL 发送 HTTPS 请求来使用代理的客户端可能会面临敏感信息泄露攻击。此问题已在 5.7 中修复。(CVE-2022-41317)

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。

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。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)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4981-1 advisory.

    Joshua Rogers discovered that Squid incorrectly handled requests with the urn: scheme. A remote attacker     could possibly use this issue to cause Squid to consume resources, leading to a denial of service.
    (CVE-2021-28651)

    Joshua Rogers discovered that Squid incorrectly handled requests to the Cache Manager API. A remote     attacker with access privileges could possibly use this issue to cause Squid to consume resources, leading     to a denial of service. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04.
    (CVE-2021-28652)

    Joshua Rogers discovered that Squid incorrectly handled certain response headers. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue was only     affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-28662)

    Joshua Rogers discovered that Squid incorrectly handled range request processing. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-31806,     CVE-2021-31807, CVE-2021-31808)

    Joshua Rogers discovered that Squid incorrectly handled certain HTTP responses. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2021-33620)

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

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

Several vulnerabilities were discovered in Squid, a proxy caching server. 

CVE-2021-28651

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

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-2021-31806

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 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

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

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.

For Debian 9 stretch, these problems have been fixed in version 3.5.23-5+deb9u7.

We recommend that you upgrade your squid3 packages.

For the detailed security status of squid3 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/squid3

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the squid packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An issue was discovered in Squid before 4.12 and 5.x     before 5.0.3. Due to use of a potentially dangerous     function, Squid and the default certificate validation     helper are vulnerable to a Denial of Service when     opening a TLS connection to an attacker-controlled     server for HTTPS. This occurs because unrecognized     error values are mapped to NULL, but later code expects     that each error value is mapped to a valid error     string.(CVE-2020-14058)

  - An issue was discovered in Squid through 4.13 and 5.x     through 5.0.4. Due to improper input validation, it     allows a trusted client to perform HTTP Request     Smuggling and access services otherwise forbidden by     the security controls. This occurs for certain     uri_whitespace configuration settings.(CVE-2020-25097)

  - 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)

  - 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 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)

  - 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)

  - 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of squid installed on the remote host is prior to 4.15-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2SQUID4-2023-004 advisory.

    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-2021-28116)

    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 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-2021-28662)

    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)

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	名稱	產品	系列	已發布	已更新	嚴重性
171863	Amazon Linux AMI : squid (ALAS-2023-1687)	Nessus	Amazon Linux Local Security Checks	2023/2/23	2024/12/11	medium
155429	Oracle Linux 8：squid: 4 (ELSA-2021-4292)	Nessus	Oracle Linux Local Security Checks	2021/11/17	2024/10/22	high
171805	Amazon Linux 2：squid (ALAS-2023-1950)	Nessus	Amazon Linux Local Security Checks	2023/2/22	2024/12/11	medium
252435	Linux Distros 未修补的漏洞：CVE-2021-31807	Nessus	Misc.	2025/8/20	2025/8/20	medium
150232	Ubuntu 18.04 LTS / 20.04 LTS : Squid vulnerabilities (USN-4981-1)	Nessus	Ubuntu Local Security Checks	2021/6/3	2024/8/27	high
150796	Debian DLA-2685-1 : squid3 security update	Nessus	Debian Local Security Checks	2021/6/15	2023/12/21	high
153296	EulerOS 2.0 SP2 : squid (EulerOS-SA-2021-2433)	Nessus	Huawei Local Security Checks	2021/9/14	2023/11/30	high
181987	Amazon Linux 2 : squid (ALASSQUID4-2023-004)	Nessus	Amazon Linux Local Security Checks	2023/9/27	2024/12/11	medium

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