The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has squid packages installed that are affected by multiple vulnerabilities:

  - An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid     calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's     being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a     new member to the stack. When adding a new member, there is no check to ensure that the stack won't     overflow. (CVE-2019-12519)

  - An issue was discovered in Squid before 5.0.2. A remote attacker can replay a sniffed Digest     Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the     attacker can overflow the nonce reference counter (a short integer). Remote code execution may occur if     the pooled token credentials are freed (instead of replayed as valid credentials). (CVE-2020-11945)

  - The Squid Software Foundation Squid HTTP Caching Proxy version 3.0 to 3.5.27, 4.0 to 4.0.22 contains a     Incorrect Pointer Handling vulnerability in ESI Response Processing that can result in Denial of Service     for all clients using the proxy.. This attack appear to be exploitable via Remote server delivers an HTTP     response payload containing valid but unusual ESI syntax.. This vulnerability appears to have been fixed     in 4.0.23 and later. (CVE-2018-1000024)

  - The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL     Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in     Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server     responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to     have been fixed in 4.0.23 and later. (CVE-2018-1000027)

  - An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use     Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as     domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it     performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote     (which would satisfy its requirements), leading to a memcpy of its length minus 1. (CVE-2019-12525)

  - The cachemgr.cgi web module of Squid through 4.7 has XSS via the user_name or auth parameter.
    (CVE-2019-13345)

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

Several vulnerabilities have been discovered in Squid3, a fully featured web proxy cache. The Common Vulnerabilities and Exposures project identifies the following issues :

  - CVE-2018-1000024     Louis Dion-Marcil discovered that Squid does not     properly handle processing of certain ESI responses. A     remote server delivering certain ESI response syntax can     take advantage of this flaw to cause a denial of service     for all clients accessing the Squid service. This     problem is limited to the Squid custom ESI parser.

  - CVE-2018-1000027     Louis Dion-Marcil discovered that Squid is prone to a     denial of service vulnerability when processing ESI     responses or downloading intermediate CA certificates. A     remote attacker can take advantage of this flaw to cause     a denial of service for all clients accessing the Squid     service.

This update for squid3 fixes the following issues: Security issues fixed :

  - CVE-2018-1000024: DoS fix caused by incorrect pointer     handling when processing ESI responses. This affects the     default custom esi_parser (bsc#1077003).

  - CVE-2018-1000027: DoS fix caused by incorrect pointer     handing whien processing ESI responses or downloading     intermediate CA certificates (bsc#1077006).

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

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-1068 advisory.

    - Resolves: #1729435 - CVE-2019-13345 squid: XSS via user_name or auth parameter       in cachemgr.cgi
    - Resolves: #1582301 - CVE-2018-1000024 CVE-2018-1000027 squid: various flaws

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.

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。

  - Squid Software Foundation Squid HTTP Caching Proxy 3.0 至 3.5.27 版和 4.0 至 4.0.22 版的 ESI 回應處理中錯誤指標處理弱點，可導致所有使用 Proxy 的用戶端發生拒絕服務。此攻擊似乎可以透過遠端伺服器利用，傳遞包含有效但異常 ESI 語法的 HTTP 回應承載。此弱點似乎已在 4.0.23 和更新版本中修正。(CVE-2018-1000024)

請注意，Nessus 依賴供應商報告的套件存在。

在功能完善的 web proxy 快取 Squid3 中發現數個弱點。Common Vulnerabilities and Exposures 專案發現下列問題：- CVE-2018-1000024 Louis Dion-Marcil 發現 Squid 未正確處理特定 ESI 回應。傳送特定 ESI 回應語法的遠端伺服器可利用此缺陷，對存取 Squid 服務的所有用戶端造成拒絕服務。此問題只會影響 Squid 自訂 ESI 剖析器。- CVE-2018-1000027 Louis Dion-Marcil 發現在處理 ESI 回應或下載中介 CA 憑證時，Squid 容易出現拒絕服務弱點。遠端攻擊者可利用此缺陷，對存取 Squid 服務的所有用戶端造成拒絕服務。

執行 CORE 5.05 / MAIN 5.05 版的遠端 NewStart CGSL 主機上安裝的 squid 套件受到多個弱點影響：

  - 在 Squid 4.7 及之前版本中發現一個問題。處理標籤 esi 時：當啟用 ESI 時，Squid 呼叫 ESIExpression: : Evaluate。此函式會使用固定的堆疊緩衝區來保留正在評估中的運算式。處理運算式時，其可評估堆疊的頂端，或將新的運算式新增至堆疊。新增運算式時，系統不會檢查堆疊是否會溢位。(CVE-2019-12519)

  - 在 Squid 5.0.2 之前版本中發現一個問題。遠端攻擊者可重播探查的摘要式驗證 nonce，以取得本應禁止的資源存取權。發生此問題是因為攻擊者可使 nonce 參照計數器 (短整數) 溢位。如果釋放共用的 token 憑證 (而非重播為有效憑證)，可能會發生遠端程式碼執行。CVE-2020-11945

  - Squid Software Foundation Squid HTTP Caching Proxy 3.0 至 3.5.27 版和 4.0 至 4.0.22 版的 ESI 回應處理中錯誤指標處理弱點，可導致所有使用 Proxy 的用戶端發生拒絕服務。此攻擊似乎可以透過遠端伺服器利用，傳遞包含有效但異常 ESI 語法的 HTTP 回應承載。此弱點似乎已在 4.0.23 和更新版本中修正。(CVE-2018-1000024)

  - Squid Software Foundation Squid HTTP Caching Proxy 4.0.23 之前版本的 HTTP 回應 X-Forwarded-For 標頭處理中存在 NULL 指標解除參照弱點，可導致 Proxy 的所有用戶端發生拒絕服務。此攻擊似乎可以透過遠端 HTTP 伺服器利用，使用 X-Forwarded-For 標頭回應特定類型的 HTTP 要求。此弱點似乎已在 4.0.23 和更新版本中修正。(CVE-2018-1000027)

  - 在 Squid 3.3.9 至 3.5.28 版、4.x 至 4.7 版中發現一個問題。當 Squid 設定為使用摘要式驗證時，它會剖析標頭 Proxy-Authorization。它會搜尋特定權杖，例如網域、uri 和 qop。Squid 會檢查此權杖的值開頭是否為引號，且結尾是否為 1。如果是的話，它會執行其長度減 2 的 memcpy。Squid 永遠不會檢查該值是否只是單引號 (這會滿足其需求)，這導致其長度減 1 的 memcpy。(CVE-2019-12525)

  - Squid 4.7 及之前版本的 cachemgr.cgi web 模組中存在透過 user_name 或 auth 參數造成的 XSS 問題。
    (CVE-2019-13345)

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 Oracle Linux 7 主機中安裝的套件受到 ELSA-2020-1068 公告中提及的多個弱點影響。

  - Squid Software Foundation Squid HTTP Caching Proxy 3.0 至 3.5.27 版和 4.0 至 4.0.22 版的 ESI 回應處理中錯誤指標處理弱點，可導致所有使用 Proxy 的用戶端發生拒絕服務。此攻擊似乎可以透過遠端伺服器利用，傳遞包含有效但異常 ESI 語法的 HTTP 回應承載。此弱點似乎已在 4.0.23 和更新版本中修正。(CVE-2018-1000024)

  - Squid 4.7 及之前版本的 cachemgr.cgi web 模組中存在透過 user_name 或 auth 參數造成的 XSS 問題。
    (CVE-2019-13345)

  - Squid Software Foundation Squid HTTP Caching Proxy 4.0.23 之前版本的 HTTP 回應 X-Forwarded-For 標頭處理中存在 NULL 指標解除參照弱點，可導致 Proxy 的所有用戶端發生拒絕服務。此攻擊似乎可以透過遠端 HTTP 伺服器利用，使用 X-Forwarded-For 標頭回應特定類型的 HTTP 要求。此弱點似乎已在 4.0.23 和更新版本中修正。(CVE-2018-1000027)

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。

ID	名稱	產品	系列	已發布	已更新	嚴重性
143989	NewStart CGSL CORE 5.05 / MAIN 5.05 : squid Multiple Vulnerabilities (NS-SA-2020-0090)	Nessus	NewStart CGSL Local Security Checks	2020/12/9	2024/2/5	critical
106957	Debian DSA-4122-1 : squid3 - security update	Nessus	Debian Local Security Checks	2018/2/23	2018/11/13	high
108528	SUSE SLES11 Security Update : squid3 (SUSE-SU-2018:0752-1)	Nessus	SuSE Local Security Checks	2018/3/22	2024/12/19	high
180752	Oracle Linux 7 : squid (ELSA-2020-1068)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2024/10/22	medium
221329	Linux Distros 未修補弱點：CVE-2018-1000024	Nessus	Misc.	2025/3/4	2025/3/4	high
106957	Debian DSA-4122-1：squid3 - 安全性更新	Nessus	Debian Local Security Checks	2018/2/23	2018/11/13	high
143989	NewStart CGSL CORE 5.05 / MAIN 5.05：squid 多個弱點 (NS-SA-2020-0090)	Nessus	NewStart CGSL Local Security Checks	2020/12/9	2024/2/5	critical
180752	Oracle Linux 7：squid (ELSA-2020-1068)	Nessus	Oracle Linux Local Security Checks	2023/9/7	2024/10/22	medium

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