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.

    -----BEGIN PGP SIGNED MESSAGE-----     Hash: SHA512

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5637-1                   security@debian.org     https://www.debian.org/security/                          Markus Koschany     March 08, 2024                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : squid     CVE ID         : CVE-2023-46724 CVE-2023-46846 CVE-2023-46847 CVE-2023-49285                      CVE-2023-49286 CVE-2023-50269 CVE-2024-23638 CVE-2024-25617                      CVE-2023-46848 CVE-2024-25111     Debian Bug     : 1055252 1054537 1055250 1055251 1058721

    Several security vulnerabilities have been discovered in Squid, a full featured     web proxy cache. Due to programming errors in Squid's HTTP request parsing,     remote attackers may be able to execute a denial of service attack by sending     large X-Forwarded-For header or trigger a stack buffer overflow while     performing HTTP Digest authentication. Other issues facilitate request     smuggling past a firewall or a denial of service against Squid's Helper process     management.

    In regard to CVE-2023-46728: Please note that support for the Gopher protocol     has simply been removed in future Squid versions. There are no plans by the     upstream developers of Squid to fix this issue. We recommend to reject all     Gopher URL requests instead.

    For the oldstable distribution (bullseye), these problems have been fixed     in version 4.13-10+deb11u3.

    For the stable distribution (bookworm), these problems have been fixed in     version 5.7-2+deb12u1.

    We recommend that you upgrade your squid packages.

    For the detailed security status of squid please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/squid

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org
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Tenable has extracted the preceding description block directly from the Debian 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 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