The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2022-1939 advisory.

    - Resolves: #1941506 - CVE-2021-28116 squid:4/squid: out-of-bounds read in WCCP       protocol data may lead to information disclosure

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

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

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 through 4.7 and 5. When receiving a request, Squid checks its cache to     see if it can serve up a response. It does this by making a MD5 hash of the absolute URL of the request.
    If found, it servers the request. The absolute URL can include the decoded UserInfo (username and     password) for certain protocols. This decoded info is prepended to the domain. This allows an attacker to     provide a username that has special characters to delimit the domain, and treat the rest of the URL as a     path or query string. An attacker could first make a request to their domain using an encoded username,     then when a request for the target domain comes in that decodes to the exact URL, it will serve the     attacker's HTML instead of the real HTML. On Squid servers that also act as reverse proxies, this allows     an attacker to gain access to features that only reverse proxies can use, such as ESI. (CVE-2019-12520)

  - 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)

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 remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2022:1939 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)

Note that Nessus has not tested for this issue 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 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.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-5104-1 advisory.

    Lyu discovered that Squid incorrectly handled WCCP protocol data. A remote attacker could use this issue     to cause Squid to crash, resulting in a denial of service, or possibly obtain sensitive information.

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

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

The remote SUSE Linux SUSE15 host has a package installed that is affected by a vulnerability as referenced in the openSUSE-SU-2021:1419-1 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)

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

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

  - 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)

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 remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2022:1939 advisory.

  - squid: out-of-bounds read in WCCP protocol data may lead to information disclosure (CVE-2021-28116)

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

The remote host is affected by the vulnerability described in GLSA-202105-14 (Squid: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Squid. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could send a specially crafted request, possibly       resulting in a Denial of Service condition or information leak.
  Workaround :

    There is no known workaround at this time.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
161279	Oracle Linux 8 : squid:4 (ELSA-2022-1939)	Nessus	Oracle Linux Local Security Checks	2022/5/18	2024/10/22	medium
161564	EulerOS 2.0 SP3 : squid (EulerOS-SA-2022-1766)	Nessus	Huawei Local Security Checks	2022/5/26	2022/5/26	high
184552	Rocky Linux 8 : squid:4 (RLSA-2022:1939)	Nessus	Rocky Linux Local Security Checks	2023/11/6	2023/12/22	medium
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
181987	Amazon Linux 2 : squid (ALASSQUID4-2023-004)	Nessus	Amazon Linux Local Security Checks	2023/9/27	2024/12/11	medium
153888	Ubuntu 18.04 LTS / 20.04 LTS : Squid vulnerability (USN-5104-1)	Nessus	Ubuntu Local Security Checks	2021/10/5	2024/8/27	medium
154755	openSUSE 15 Security Update : squid (openSUSE-SU-2021:1419-1)	Nessus	SuSE Local Security Checks	2021/11/1	2021/11/1	medium
156309	EulerOS 2.0 SP8 : squid (EulerOS-SA-2021-2815)	Nessus	Huawei Local Security Checks	2021/12/26	2021/12/26	medium
160901	CentOS 8 : squid:4 (CESA-2022:1939)	Nessus	CentOS Local Security Checks	2022/5/10	2022/5/10	medium
162356	EulerOS 2.0 SP5 : squid (EulerOS-SA-2022-1916)	Nessus	Huawei Local Security Checks	2022/6/17	2022/6/17	medium
150021	GLSA-202105-14 : Squid: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2021/5/27	2024/1/12	high

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