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。

遠端 Oracle Linux 8 主機中安裝的套件受到 ELSA-2021-4292 公告中提及的多個弱點影響。

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於存在緩衝區管理錯誤，可觸發拒絕服務攻擊。使用 urn:scheme 解析要求時，剖析器會洩漏少量記憶體。不過，有個不明攻擊方法可輕易觸發大量記憶體耗用。(CVE-2021-28651)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於記憶體管理的錯誤，此弱點容易透過 HTTP 範圍請求處理受到拒絕服務攻擊的影響 (針對使用 Proxy 的所有用戶端)。 (CVE-2021-31806)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於存在整數溢位問題，在傳送對 HTTP Range 要求的回應時，遠端伺服器會拒絕服務。預期存在於 HTTP 流量中且沒有惡意的標頭可觸發此問題。
    (CVE-2021-31807)

  在 4.15 之前的 Squid 4.x 和 5.0.6 之前的 5.x 中發現一個問題。若遠端伺服器透過 HTTP 或 HTTPS 傳送特定回應標頭，會發生拒絕服務的情形。此標頭可能會在安全的網路流量中合理地發生。(CVE-2021-28662)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於輸入驗證錯誤，此弱點容易遭受拒絕服務攻擊 (針對使用 Proxy 的所有用戶端)。用戶端會傳送 HTTP 範圍請求以觸發此要求。(CVE-2021-31808)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於不正確的剖析器驗證所致，此弱點允許對 Cache Manager API 發動拒絕服務攻擊。這會允許受信任的用戶端觸發記憶體洩漏。過一陣子後就會透過不明的簡短查詢字串導致拒絕服務。此攻擊僅限於具有 Cache Manager API 存取特權的用戶端。(CVE-2021-28652)

  - 4.15 之前的 Squid 和 5.0.6 之前的 5.x 允許遠端伺服器透過 HTTP 回應導致拒絕服務 (影響所有用戶端的可用性)。此問題的觸發程序為標頭，伺服器可能會判定其應存在於 HTTP 流量中，且沒有惡意。(CVE-2021-33620)

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。

遠端主機上安裝的 squid 版本為 3.5.20-17 之前版本。因此，會受到 ALAS2-2023-1950 公告中所提及的多個弱點影響。

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於存在緩衝區管理錯誤，可觸發拒絕服務攻擊。使用 urn:scheme 解析要求時，剖析器會洩漏少量記憶體。不過，有個不明攻擊方法可輕易觸發大量記憶體耗用。(CVE-2021-28651)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於不正確的剖析器驗證所致，此弱點允許對 Cache Manager API 發動拒絕服務攻擊。這會允許受信任的用戶端觸發記憶體洩漏。過一陣子後就會透過不明的簡短查詢字串導致拒絕服務。此攻擊僅限於具有 Cache Manager API 存取特權的用戶端。(CVE-2021-28652)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於記憶體管理的錯誤，此弱點容易透過 HTTP 範圍請求處理受到拒絕服務攻擊的影響 (針對使用 Proxy 的所有用戶端)。 (CVE-2021-31806)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於存在整數溢位問題，在傳送對 HTTP Range 要求的回應時，遠端伺服器會拒絕服務。預期存在於 HTTP 流量中且沒有惡意的標頭可觸發此問題。
    (CVE-2021-31807)

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於輸入驗證錯誤，此弱點容易遭受拒絕服務攻擊 (針對使用 Proxy 的所有用戶端)。用戶端會傳送 HTTP 範圍請求以觸發此要求。(CVE-2021-31808)

  - 4.15 之前的 Squid 和 5.0.6 之前的 5.x 允許遠端伺服器透過 HTTP 回應導致拒絕服務 (影響所有用戶端的可用性)。此問題的觸發程序為標頭，伺服器可能會判定其應存在於 HTTP 流量中，且沒有惡意。(CVE-2021-33620)

  - 在 Squid 4.9 至 4.17 版、5.0.6 至 5.6 版中發現一個問題。由於內部 URI 的處理不一致，因此可透過對內部快取管理員 URL 的 HTTPS 要求洩漏有關使用 Proxy 的用戶端的敏感資訊。5.7 版已經修正此問題。(CVE-2022-41317)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  在 4.15 版之前和 5.0.6 之前 5.x 版的 Squid 中，發現一個問題。由於存在整數溢位問題，在傳送對 HTTP Range 要求的回應時，遠端伺服器會拒絕服務。預期存在於 HTTP 流量中且沒有惡意的標頭可觸發此問題。
    (CVE-2021-31807)

請注意，Nessus 依賴供應商報告的套件存在。

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 Nessus relies on the presence of the package as reported by the vendor.

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 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	Name	Product	Family	Published	Updated	Severity
155039	CentOS 8：squid: 4 (CESA-2021: 4292)	Nessus	CentOS Local Security Checks	11/11/2021	11/24/2023	high
155429	Oracle Linux 8：squid：4 (ELSA-2021-4292)	Nessus	Oracle Linux Local Security Checks	11/17/2021	10/22/2024	high
171805	Amazon Linux 2：squid (ALAS-2023-1950)	Nessus	Amazon Linux Local Security Checks	2/22/2023	12/11/2024	medium
252435	Linux Distros 未修補的弱點：CVE-2021-31807	Nessus	Misc.	8/20/2025	8/20/2025	medium
236478	Alibaba Cloud Linux 3 : 0132: squid:4 (ALINUX3-SA-2022:0132)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	5/14/2025	medium
252435	Linux Distros Unpatched Vulnerability : CVE-2021-31807	Nessus	Misc.	8/20/2025	8/20/2025	medium
155429	Oracle Linux 8 : squid:4 (ELSA-2021-4292)	Nessus	Oracle Linux Local Security Checks	11/17/2021	10/22/2024	high
171805	Amazon Linux 2 : squid (ALAS-2023-1950)	Nessus	Amazon Linux Local Security Checks	2/22/2023	12/11/2024	medium

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