This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability. The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-service condition to users of the system. Was ZDI-CAN-6088.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - squid: Heap overflow issue in URN processing (CVE-2019-12526)

  - Off-by-one error in the snmpHandleUdp function in snmp_core.cc in Squid 2.x and 3.x, when an SNMP port is     configured, allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary     code via a crafted UDP SNMP request, which triggers a heap-based buffer overflow. (CVE-2014-6270)

  - Squid 3.4.4 through 3.4.11 and 3.5.0.1 through 3.5.1, when Digest authentication is used, allow remote     authenticated users to retain access by leveraging a stale nonce, aka Nonce replay vulnerability.
    (CVE-2014-9749)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code     execution (CVE-2020-11945)

  - squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)

  - Squid, when transparent interception mode is enabled, uses the HTTP Host header to determine the remote     endpoint, which allows remote attackers to bypass access controls for Flash, Java, Silverlight, and     probably other technologies, and possibly communicate with restricted intranet sites, via a crafted web     page that causes a client to send HTTP requests with a modified Host header. (CVE-2009-0801)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The version of squid installed on the remote host is prior to 3.5.20-15. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1486 advisory.

    An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of     sensitive information from heap memory, such as information associated with other users' sessions or non-     Squid processes. (CVE-2019-12528)

    This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid     Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability.
    The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger     the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of-     service condition to users of the system. Was ZDI-CAN-6088. it was found that Squid, when used as a     reverse proxy, did not handle ESI responses properly. A malicious web server could use this flaw to crash     Squid. (CVE-2018-1172)

    An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is     vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the     raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR     protections and may aid attackers isolating memory areas to target for remote code execution attacks.
    (CVE-2019-18679)

    An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can     cause a buffer overflow in a Squid instance acting as a reverse proxy. (CVE-2020-8450)

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.

According to its banner, the version of Squid running on the remote host is 3.1.x after or equal to 3.1.12.2 and prior or equal to 3.1.23, 3.2.x after or equal to 3.2.0.8 and prior or equal to 3.2.0.8, 3.3.x, 3.4.x, 3.5.x prior or equal to 3.5.27, or 4.x prior to 4.0.13. It is, therefore, affected by a denial of service (DoS) vulnerability in the ESI response processing component due to incorrect pointer handling. A remote attacker controlled server can exploit this issue, via a crafted ESI response, to cause a denial of service for all clients accessing the Squid service.

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

This update for squid3 fixes the following issues :

  - CVE-2018-1172: Fixed a DoS caused by incorrect handling     of ESI responses. (bsc#1090089, SQUID-2018:3)

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.

This update fixes the following issues :

  - CVE-2018-1172: Squid Proxy Cache Denial of Service     vulnerability (bsc#1090089).

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.

This update fixes the following issues :

  - CVE-2018-1172: Squid Proxy Cache Denial of Service     vulnerability (bsc#1090089). This update was imported     from the SUSE:SLE-12-SP2:Update update project.

ID	Name	Product	Family	Severity
198536	RHEL 7 : squid (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
198515	RHEL 6 : squid (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
195586	RHEL 7 : squid (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
140199	Amazon Linux 2 : squid (ALAS-2020-1486)	Nessus	Amazon Linux Local Security Checks	high
119725	Squid 3.1.12.2 <= 3.1.x <= 3.1.23 / 3.2.0.8 <= 3.2.x <= 3.2.14 / 3.3.x / 3.4.x / 3.5.x <= 3.5.27 / 4.x < 4.0.13 Denial of Service Vulnerability (SQUID-2018:3)	Nessus	Firewalls	medium
110032	SUSE SLES11 Security Update : squid3 (SUSE-SU-2018:1365-1)	Nessus	SuSE Local Security Checks	medium
109547	SUSE SLES12 Security Update : squid (SUSE-SU-2018:1122-1)	Nessus	SuSE Local Security Checks	medium
109537	openSUSE Security Update : squid (openSUSE-2018-412)	Nessus	SuSE Local Security Checks	medium

Detections

Analytics

CVE-2018-1172

medium

Tenable Plugins

critical

critical

high

high

medium

medium

medium

medium