Vulnerabilities > CVE-2018-19131 - Cross-site Scripting vulnerability in Squid-Cache Squid
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
LOW Integrity impact
LOW Availability impact
NONE Summary
Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Embedding Scripts in Non-Script Elements This attack is a form of Cross-Site Scripting (XSS) where malicious scripts are embedded in elements that are not expected to host scripts such as image tags (<img>), comments in XML documents (< !-CDATA->), etc. These tags may not be subject to the same input validation, output validation, and other content filtering and checking routines, so this can create an opportunity for an attacker to tunnel through the application's elements and launch a XSS attack through other elements. As with all remote attacks, it is important to differentiate the ability to launch an attack (such as probing an internal network for unpatched servers) and the ability of the remote attacker to collect and interpret the output of said attack.
- Embedding Scripts within Scripts An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
- Cross-Site Scripting in Error Pages An attacker distributes a link (or possibly some other query structure) with a request to a third party web server that is malformed and also contains a block of exploit code in order to have the exploit become live code in the resulting error page. When the third party web server receives the crafted request and notes the error it then creates an error message that echoes the malformed message, including the exploit. Doing this converts the exploit portion of the message into to valid language elements that are executed by the viewing browser. When a victim executes the query provided by the attacker the infected error message error message is returned including the exploit code which then runs in the victim's browser. XSS can result in execution of code as well as data leakage (e.g. session cookies can be sent to the attacker). This type of attack is especially dangerous since the exploit appears to come from the third party web server, who the victim may trust and hence be more vulnerable to deception.
- Cross-Site Scripting Using Alternate Syntax The attacker uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.
Nessus
NASL family SuSE Local Security Checks NASL id OPENSUSE-2018-1429.NASL description This update for squid fixes the following issues : Security issues fixed : - CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). - CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed : - Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). - Install license correctly (bsc#1082318). This update was imported from the SUSE:SLE-15:Update update project. last seen 2020-06-05 modified 2018-11-21 plugin id 119079 published 2018-11-21 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119079 title openSUSE Security Update : squid (openSUSE-2018-1429) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from openSUSE Security Update openSUSE-2018-1429. # # The text description of this plugin is (C) SUSE LLC. # include("compat.inc"); if (description) { script_id(119079); script_version("1.3"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04"); script_cve_id("CVE-2018-19131", "CVE-2018-19132"); script_name(english:"openSUSE Security Update : squid (openSUSE-2018-1429)"); script_summary(english:"Check for the openSUSE-2018-1429 patch"); script_set_attribute( attribute:"synopsis", value:"The remote openSUSE host is missing a security update." ); script_set_attribute( attribute:"description", value: "This update for squid fixes the following issues : Security issues fixed : - CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). - CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed : - Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). - Install license correctly (bsc#1082318). This update was imported from the SUSE:SLE-15:Update update project." ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1082318" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1112066" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1112695" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1113668" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1113669" ); script_set_attribute( attribute:"solution", value:"Update the affected squid packages." ); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:squid"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:squid-debuginfo"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:squid-debugsource"); script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.0"); script_set_attribute(attribute:"patch_publication_date", value:"2018/11/20"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/21"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"SuSE Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/SuSE/release"); if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE"); if (release !~ "^(SUSE15\.0)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.0", release); if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); ourarch = get_kb_item("Host/cpu"); if (!ourarch) audit(AUDIT_UNKNOWN_ARCH); if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch); flag = 0; if ( rpm_check(release:"SUSE15.0", reference:"squid-4.4-lp150.4.3.2") ) flag++; if ( rpm_check(release:"SUSE15.0", reference:"squid-debuginfo-4.4-lp150.4.3.2") ) flag++; if ( rpm_check(release:"SUSE15.0", reference:"squid-debugsource-4.4-lp150.4.3.2") ) flag++; if (flag) { if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get()); else security_warning(0); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "squid / squid-debuginfo / squid-debugsource"); }
NASL family Firewalls NASL id SQUID_2018_4.NASL description According to its banner, the version of Squid running on the remote host is 3.1.x after or equal to 3.1.12.1 and prior or equal to 3.1.23, 3.2.x after or equal to 3.2.0.4, 3.3.x, 3.4.x, 3.5.x prior or equal to 3.5.28, or 4.x prior to 4.4. It is, therefore, affected by a cross-site scripting (XSS) vulnerability due to improper validation of user-supplied input before returning it to users. A remote attacker controlled server can exploit this, by triggering error page delivery to a client with injected arbitrary script code that will execute in the client last seen 2020-06-01 modified 2020-06-02 plugin id 119726 published 2018-12-17 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119726 title Squid 3.1.12.1 <= 3.1.x <= 3.1.23 / 3.2.0.4 <= 3.2.x / 3.3.x / 3.4.x / 3.5.x <= 3.5.28 / 4.x < 4.4 Cross-Site Scripting Vulnerability (SQUID-2018:4) NASL family Fedora Local Security Checks NASL id FEDORA_2018-714298460E.NASL description Version update + Security fix for CVE-2018-19131 and CVE-2018-19132 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-05 modified 2019-01-03 plugin id 120523 published 2019-01-03 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/120523 title Fedora 29 : 7:squid (2018-714298460e) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-3771-1.NASL description This update for squid fixes the following issues : Security issues fixed : CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed: Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). Install license correctly (bsc#1082318). 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. last seen 2020-06-01 modified 2020-06-02 plugin id 119012 published 2018-11-16 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119012 title SUSE SLES12 Security Update : squid (SUSE-SU-2018:3771-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-3790-1.NASL description This update for squid3 fixes the following issues : Security issue fixed : CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). 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. last seen 2020-06-01 modified 2020-06-02 plugin id 119035 published 2018-11-19 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119035 title SUSE SLES11 Security Update : squid3 (SUSE-SU-2018:3790-1) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-3771-2.NASL description This update for squid fixes the following issues : Security issues fixed : CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed: Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). Install license correctly (bsc#1082318). 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. last seen 2020-05-12 modified 2018-12-10 plugin id 119554 published 2018-12-10 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119554 title SUSE SLES12 Security Update : squid (SUSE-SU-2018:3771-2) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-2231.NASL description According to the versions of the squid packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - Incorrect HTTP Request header comparison in Squid HTTP Proxy 3.5.0.1 through 3.5.22, and 4.0.1 through 4.0.16 results in Collapsed Forwarding feature mistakenly identifying some private responses as being suitable for delivery to multiple clients.(CVE-2016-10003) - Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.(CVE-2018-19131) - Squid before 4.4, when SNMP is enabled, allows a denial of service (Memory Leak) via an SNMP packet.(CVE-2018-19132) 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. last seen 2020-05-08 modified 2019-11-08 plugin id 130693 published 2019-11-08 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130693 title EulerOS 2.0 SP5 : squid (EulerOS-SA-2019-2231) NASL family SuSE Local Security Checks NASL id OPENSUSE-2019-936.NASL description This update for squid fixes the following issues : Security issues fixed : - CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). - CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed : - Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). - Install license correctly (bsc#1082318). This update was imported from the SUSE:SLE-15:Update update project. last seen 2020-06-01 modified 2020-06-02 plugin id 123382 published 2019-03-27 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/123382 title openSUSE Security Update : squid (openSUSE-2019-936) NASL family SuSE Local Security Checks NASL id SUSE_SU-2018-3786-1.NASL description This update for squid fixes the following issues : Security issues fixed : CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed: Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). Install license correctly (bsc#1082318). 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. last seen 2020-03-18 modified 2019-01-02 plugin id 120164 published 2019-01-02 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/120164 title SUSE SLES15 Security Update : squid (SUSE-SU-2018:3786-1) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-2445.NASL description According to the versions of the squid packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - Squid before 4.4 has XSS via a crafted X.509 certificate during HTTP(S) error page generation for certificate errors.(CVE-2018-19131) - Squid before 4.4, when SNMP is enabled, allows a denial of service (Memory Leak) via an SNMP packet.(CVE-2018-19132) - Incorrect HTTP Request header comparison in Squid HTTP Proxy 3.5.0.1 through 3.5.22, and 4.0.1 through 4.0.16 results in Collapsed Forwarding feature mistakenly identifying some private responses as being suitable for delivery to multiple clients.(CVE-2016-10003) - 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 last seen 2020-05-08 modified 2019-12-04 plugin id 131599 published 2019-12-04 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131599 title EulerOS 2.0 SP2 : squid (EulerOS-SA-2019-2445) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-1044.NASL description According to the versions of the squid packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A Cross-Site Scripting vulnerability has been discovered in squid in the way X.509 certificates fields are displayed in some error pages. An attacker who can control the certificate of the origin content server may use this flaw to inject scripting code in the squid generated page, which is executed on the client last seen 2020-05-06 modified 2019-02-15 plugin id 122217 published 2019-02-15 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/122217 title EulerOS 2.0 SP3 : squid (EulerOS-SA-2019-1044) NASL family SuSE Local Security Checks NASL id OPENSUSE-2018-1428.NASL description This update for squid fixes the following issues : Security issues fixed : - CVE-2018-19131: Fixed Cross-Site-Scripting vulnerability in the TLS error handling (bsc#1113668). - CVE-2018-19132: Fixed small memory leak in processing of SNMP packets (bsc#1113669). Non-security issues fixed : - Create runtime directories needed when SMP mode is enabled (bsc#1112695, bsc#1112066). - Install license correctly (bsc#1082318). last seen 2020-06-05 modified 2018-11-21 plugin id 119078 published 2018-11-21 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119078 title openSUSE Security Update : squid (openSUSE-2018-1428)
References
- http://www.squid-cache.org/Advisories/SQUID-2018_4.txt
- http://www.squid-cache.org/Advisories/SQUID-2018_4.txt
- http://www.squid-cache.org/Versions/v5/changesets/squid-5-6feeb15ff312f3e145763adf8d234ed6a0b3f11d.patch
- http://www.squid-cache.org/Versions/v5/changesets/squid-5-6feeb15ff312f3e145763adf8d234ed6a0b3f11d.patch
- https://github.com/squid-cache/squid/pull/306
- https://github.com/squid-cache/squid/pull/306