Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs in HTTP Request messages or constructing ftp:// URLs from FTP Native input.

An update of the squid package has been released.

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5637 advisory.

  - Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions     3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of     Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial     of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a     server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version     6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch     archives. Those who you use a prepackaged version of Squid should refer to the package vendor for     availability information on updated packages. (CVE-2023-46724)

  - Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer     dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The     gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this     bug are possible to be received from any gopher server, even those without malicious intent. Gopher     support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade     should reject all gopher URL requests. (CVE-2023-46728)

  - SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote     attacker to perform Request/Response smuggling past firewall and frontend security systems.
    (CVE-2023-46846)

  - Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by     writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest     Authentication. (CVE-2023-46847)

  - Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs     in HTTP Request messages or constructing ftp:// URLs from FTP Native input. (CVE-2023-46848)

  - Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Buffer Overread bug     Squid is vulnerable to a Denial of Service attack against Squid HTTP Message processing. This bug is fixed     by Squid version 6.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
    (CVE-2023-49285)

  - Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to an Incorrect Check of     Function Return Value bug Squid is vulnerable to a Denial of Service attack against its Helper process     management. This bug is fixed by Squid version 6.5. Users are advised to upgrade. There are no known     workarounds for this vulnerability. (CVE-2023-49286)

  - Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through     2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial     of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of     Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is     configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the     stable releases can be found in Squid's patch archives. (CVE-2023-50269)

  - Squid is a caching proxy for the Web. Due to an expired pointer reference bug, Squid prior to version 6.6     is vulnerable to a Denial of Service attack against Cache Manager error responses. This problem allows a     trusted client to perform Denial of Service when generating error pages for Client Manager reports. Squid     older than 5.0.5 have not been tested and should be assumed to be vulnerable. All Squid-5.x up to and     including 5.9 are vulnerable. All Squid-6.x up to and including 6.5 are vulnerable. This bug is fixed by     Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in     Squid's patch archives. As a workaround, prevent access to Cache Manager using Squid's main access     control: `http_access deny manager`. (CVE-2024-23638)

  - Squid is a web proxy cache. Starting in version 3.5.27 and prior to version 6.8, Squid may be vulnerable     to a Denial of Service attack against HTTP Chunked decoder due to an uncontrolled recursion bug. This     problem allows a remote attacker to cause Denial of Service when sending a crafted, chunked, encoded HTTP     Message. This bug is fixed in Squid version 6.8. In addition, patches addressing this problem for the     stable releases can be found in Squid's patch archives. There is no workaround for this issue.
    (CVE-2024-25111)

  - Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse     of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header     parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending     oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the     request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version     6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in     cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time     prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5.
    There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2     (CVE-2024-25617)

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 20.04 LTS / 22.04 LTS / 23.04 / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6500-1 advisory.

    Joshua Rogers discovered that Squid incorrectly handled validating certain SSL certificates. A remote     attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This     issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10. (CVE-2023-46724)

    Joshua Rogers discovered that Squid incorrectly handled the Gopher protocol. A remote attacker could     possibly use this issue to cause Squid to crash, resulting in a denial of service. Gopher support has been     disabled in this update. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.04.
    (CVE-2023-46728)

    Keran Mu and Jianjun Chen discovered that Squid incorrectly handled the chunked decoder. A remote attacker     could possibly use this issue to perform HTTP request smuggling attacks. (CVE-2023-46846)

    Joshua Rogers discovered that Squid incorrectly handled HTTP Digest Authentication. A remote attacker     could possibly use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2023-46847)

    Joshua Rogers discovered that Squid incorrectly handled certain FTP urls. A remote attacker could possibly     use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2023-46848)

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.

The remote Oracle Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2023-6748 advisory.

    [7:5.5-6.1]
    - Resolves: RHEL-14819 - squid: squid: denial of Servicein FTP
    - Resolves: RHEL-14807 - squid: squid: Denial of Service in HTTP Digest       Authentication
    - Resolves: RHEL-14780 - squid: squid: Request/Response smuggling in HTTP/1.1       and ICAP

    [7:5.5-6]
    - Resolves: #2231827 - Crash with half_closed_client on

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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-429 advisory.

    2023-12-06: CVE-2023-46728 was added to this advisory.

    Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions     3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of     Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial     of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a     server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version     6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch     archives. Those who you use a prepackaged version of Squid should refer to the package vendor for     availability information on updated packages. (CVE-2023-46724)

    Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer     dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The     gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this     bug are possible to be received from any gopher server, even those without malicious intent. Gopher     support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade     should reject all gopher URL requests. (CVE-2023-46728)

    Due to chunked decoder lenience Squid is vulnerable to Request/Response smuggling attacks when parsing     HTTP/1.1 and ICAP messages. (CVE-2023-46846)

    This problem allows a remote client to perform Denial of Service when sending ftp:// URLs in HTTP Request     messages or constructing ftp:// URLs from FTP Native input.

    This issue is triggered during access control security checks, meaning clients may not have been permitted     to use the proxy yet.

    FTP support is always enabled and cannot be disabled completely. (CVE-2023-46848)

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 Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2023:6266 advisory.

  - SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote     attacker to perform Request/Response smuggling past firewall and frontend security systems.
    (CVE-2023-46846)

  - Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by     writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest     Authentication. (CVE-2023-46847)

  - Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs     in HTTP Request messages or constructing ftp:// URLs from FTP Native input. (CVE-2023-46848)

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4384-1 advisory.

  - Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions     3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of     Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial     of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a     server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version     6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch     archives. Those who you use a prepackaged version of Squid should refer to the package vendor for     availability information on updated packages. (CVE-2023-46724)

  - SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote     attacker to perform Request/Response smuggling past firewall and frontend security systems.
    (CVE-2023-46846)

  - Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by     writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest     Authentication. (CVE-2023-46847)

  - Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs     in HTTP Request messages or constructing ftp:// URLs from FTP Native input. (CVE-2023-46848)

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

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2023:6748 advisory.

    Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data     objects.

    Security Fix(es):

    * squid: Denial of Service in HTTP Digest Authentication (CVE-2023-46847)

    * squid: Request/Response smuggling in HTTP/1.1 and ICAP (CVE-2023-46846)

    * squid: denial of Service in FTP (CVE-2023-46848)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4381-1 advisory.

  - Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions     3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of     Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial     of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a     server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version     6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch     archives. Those who you use a prepackaged version of Squid should refer to the package vendor for     availability information on updated packages. (CVE-2023-46724)

  - SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote     attacker to perform Request/Response smuggling past firewall and frontend security systems.
    (CVE-2023-46846)

  - Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by     writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest     Authentication. (CVE-2023-46847)

  - Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs     in HTTP Request messages or constructing ftp:// URLs from FTP Native input. (CVE-2023-46848)

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

The remote SUSE Linux SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4380-1 advisory.

  - Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions     3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of     Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial     of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a     server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version     6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch     archives. Those who you use a prepackaged version of Squid should refer to the package vendor for     availability information on updated packages. (CVE-2023-46724)

  - SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote     attacker to perform Request/Response smuggling past firewall and frontend security systems.
    (CVE-2023-46846)

  - Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by     writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest     Authentication. (CVE-2023-46847)

  - Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs     in HTTP Request messages or constructing ftp:// URLs from FTP Native input. (CVE-2023-46848)

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

The remote Oracle Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2023-6266 advisory.

    - Improve HTTP chunked encoding compliance (CVE-2023-46846)
    - Fix stack buffer overflow when parsing Digest Authorization (CVE-2023-46847)

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 remote AlmaLinux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the ALSA-2023:6266 advisory.

  - SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote     attacker to perform Request/Response smuggling past firewall and frontend security systems.
    (CVE-2023-46846)

  - Squid is vulnerable to a Denial of Service, where a remote attacker can perform buffer overflow attack by     writing up to 2 MB of arbitrary data to heap memory when Squid is configured to accept HTTP Digest     Authentication. (CVE-2023-46847)

  - Squid is vulnerable to Denial of Service, where a remote attacker can perform DoS by sending ftp:// URLs     in HTTP Request messages or constructing ftp:// URLs from FTP Native input. (CVE-2023-46848)

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

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2023:6266 advisory.

    Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data     objects.

    Security Fix(es):

    * SQUID-2023:3 squid: Denial of Service in HTTP Digest Authentication (CVE-2023-46847)

    * SQUID-2023:1 squid: Request/Response smuggling in HTTP/1.1 and ICAP (CVE-2023-46846)

    * SQUID-2023:5 squid: denial of Service in FTP (CVE-2023-46848)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2023:6268 advisory.

    Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data     objects.

    Security Fix(es):

    * SQUID-2023:3 squid: Denial of Service in HTTP Digest Authentication (CVE-2023-46847)

    * SQUID-2023:1 squid: Request/Response smuggling in HTTP/1.1 and ICAP (CVE-2023-46846)

    * SQUID-2023:5 squid: denial of Service in FTP (CVE-2023-46848)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

ID	Name	Product	Family	Severity
204419	Photon OS 5.0: Squid PHSA-2023-5.0-0154	Nessus	PhotonOS Local Security Checks	medium
191759	Debian dsa-5637 : squid - security update	Nessus	Debian Local Security Checks	medium
186076	Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 : Squid vulnerabilities (USN-6500-1)	Nessus	Ubuntu Local Security Checks	medium
185891	Oracle Linux 9 : squid (ELSA-2023-6748)	Nessus	Oracle Linux Local Security Checks	medium
185721	Amazon Linux 2023 : squid (ALAS2023-2023-429)	Nessus	Amazon Linux Local Security Checks	medium
185472	Rocky Linux 9 : squid (RLSA-2023:6266)	Nessus	Rocky Linux Local Security Checks	medium
185421	SUSE SLES15 Security Update : squid (SUSE-SU-2023:4384-1)	Nessus	SuSE Local Security Checks	medium
185116	RHEL 9 : squid (RHSA-2023:6748)	Nessus	Red Hat Local Security Checks	medium
184796	SUSE SLES12 Security Update : squid (SUSE-SU-2023:4381-1)	Nessus	SuSE Local Security Checks	medium
184793	SUSE SLES15 / openSUSE 15 Security Update : squid (SUSE-SU-2023:4380-1)	Nessus	SuSE Local Security Checks	medium
184382	Oracle Linux 9 : squid (ELSA-2023-6266)	Nessus	Oracle Linux Local Security Checks	medium
184354	AlmaLinux 9 : squid (ALSA-2023:6266)	Nessus	Alma Linux Local Security Checks	medium
184205	RHEL 9 : squid (RHSA-2023:6266)	Nessus	Red Hat Local Security Checks	medium
184204	RHEL 9 : squid (RHSA-2023:6268)	Nessus	Red Hat Local Security Checks	medium

Detections

Analytics

CVE-2023-46848

high

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium