Vulnerabilities > CVE-2017-7840 - Cross-site Scripting vulnerability in Mozilla Firefox
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
LOW Integrity impact
LOW Availability impact
NONE Summary
JavaScript can be injected into an exported bookmarks file by placing JavaScript code into user-supplied tags in saved bookmarks. If the resulting exported HTML file is later opened in a browser this JavaScript will be executed. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks if users were convinced to add malicious tags to bookmarks, export them, and then open the resulting file. This vulnerability affects Firefox < 57.
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 Windows NASL id MOZILLA_FIREFOX_57_0.NASL description The version of Mozilla Firefox installed on the remote Windows host is prior to 57. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes. last seen 2020-06-01 modified 2020-06-02 plugin id 104638 published 2017-11-16 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104638 title Mozilla Firefox < 57 Multiple Vulnerabilities code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(104638); script_version("1.5"); script_cvs_date("Date: 2019/11/12"); script_cve_id( "CVE-2017-7826", "CVE-2017-7827", "CVE-2017-7828", "CVE-2017-7830", "CVE-2017-7831", "CVE-2017-7832", "CVE-2017-7833", "CVE-2017-7834", "CVE-2017-7835", "CVE-2017-7836", "CVE-2017-7837", "CVE-2017-7838", "CVE-2017-7839", "CVE-2017-7840", "CVE-2017-7842" ); script_bugtraq_id(101832); script_xref(name:"MFSA", value:"2017-24"); script_name(english:"Mozilla Firefox < 57 Multiple Vulnerabilities"); script_summary(english:"Checks the version of Firefox."); script_set_attribute(attribute:"synopsis", value: "A web browser installed on the remote Windows host is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "The version of Mozilla Firefox installed on the remote Windows host is prior to 57. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes."); script_set_attribute(attribute:"see_also", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/"); script_set_attribute(attribute:"solution", value: "Upgrade to Mozilla Firefox version 57 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-7827"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/14"); script_set_attribute(attribute:"patch_publication_date", value:"2017/11/14"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/11/16"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:firefox"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Windows"); script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("mozilla_org_installed.nasl"); script_require_keys("Mozilla/Firefox/Version"); exit(0); } include("mozilla_version.inc"); port = get_kb_item("SMB/transport"); if (!port) port = 445; installs = get_kb_list("SMB/Mozilla/Firefox/*"); if (isnull(installs)) audit(AUDIT_NOT_INST, "Firefox"); mozilla_check_version(installs:installs, product:'firefox', fix:'57', severity:SECURITY_HOLE);NASL family MacOS X Local Security Checks NASL id MACOSX_FIREFOX_52_5_ESR.NASL description The version of Mozilla Firefox ESR installed on the remote macOS or Mac OS X host is prior to 52.5. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes. last seen 2020-06-01 modified 2020-06-02 plugin id 104635 published 2017-11-16 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104635 title Mozilla Firefox ESR < 52.5 Multiple Vulnerabilities (macOS) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(104635); script_version("1.5"); script_cvs_date("Date: 2019/11/12"); script_cve_id( "CVE-2017-7826", "CVE-2017-7827", "CVE-2017-7828", "CVE-2017-7830", "CVE-2017-7831", "CVE-2017-7832", "CVE-2017-7833", "CVE-2017-7834", "CVE-2017-7835", "CVE-2017-7836", "CVE-2017-7837", "CVE-2017-7838", "CVE-2017-7839", "CVE-2017-7840", "CVE-2017-7842" ); script_bugtraq_id(101832); script_xref(name:"MFSA", value:"2017-25"); script_name(english:"Mozilla Firefox ESR < 52.5 Multiple Vulnerabilities (macOS)"); script_summary(english:"Checks the version of Firefox."); script_set_attribute(attribute:"synopsis", value: "A web browser installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "The version of Mozilla Firefox ESR installed on the remote macOS or Mac OS X host is prior to 52.5. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes."); script_set_attribute(attribute:"see_also", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2017-25/"); script_set_attribute(attribute:"solution", value: "Upgrade to Mozilla Firefox ESR version 52.5 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-7827"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/11/14"); script_set_attribute(attribute:"patch_publication_date", value:"2017/11/14"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/11/16"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:firefox_esr"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"MacOS X Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("macosx_firefox_installed.nasl"); script_require_keys("MacOSX/Firefox/Version"); exit(0); } include("mozilla_version.inc"); kb_base = "MacOSX/Firefox"; get_kb_item_or_exit(kb_base+"/Installed"); version = get_kb_item_or_exit(kb_base+"/Version", exit_code:1); path = get_kb_item_or_exit(kb_base+"/Path", exit_code:1); is_esr = get_kb_item(kb_base+"/is_esr"); if (isnull(is_esr)) audit(AUDIT_NOT_INST, "Mozilla Firefox ESR"); mozilla_check_version(version:version, path:path, product:'firefox', esr:TRUE, fix:'52.5', min:'52', severity:SECURITY_HOLE);NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_6056BF68F5704E70B740B9F606971283.NASL description Pale Moon reports : CVE-2017-7832: Domain spoofing through use of dotless last seen 2020-06-01 modified 2020-06-02 plugin id 104836 published 2017-11-29 reporter This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104836 title FreeBSD : palemoon -- multiple vulnerabilities (6056bf68-f570-4e70-b740-b9f606971283) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3477-4.NASL description USN-3477-1 fixed vulnerabilities in Firefox. The update introduced a crash reporting issue where background tab crash reports were sent to Mozilla without user opt-in. This update fixes the problem. We apologize for the inconvenience. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, read uninitialized memory, obtain sensitive information, bypass same-origin restrictions, bypass CSP protections, bypass mixed content blocking, spoof the addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827, CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833, CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842) It was discovered that javascript: URLs pasted in to the addressbar would be executed instead of being blocked in some circumstances. If a user were tricked in to copying a specially crafted URL in to the addressbar, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7839) It was discovered that exported bookmarks do not strip script elements from user-supplied tags. If a user were tricked in to adding specially crafted tags to bookmarks, exporting them and then opening the resulting HTML file, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7840). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu 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 105542 published 2018-01-04 reporter Ubuntu Security Notice (C) 2018-2019 Canonical, Inc. / NASL script (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/105542 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 / 17.10 : firefox regression (USN-3477-4) NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_F78EAC48C3D146668DE563CEEA25A578.NASL description Mozilla Foundation reports : CVE-2017-7828: Use-after-free of PressShell while restyling layout CVE-2017-7830: Cross-origin URL information leak through Resource Timing API CVE-2017-7831: Information disclosure of exposed properties on JavaScript proxy objects CVE-2017-7832: Domain spoofing through use of dotless last seen 2020-06-01 modified 2020-06-02 plugin id 104564 published 2017-11-15 reporter This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104564 title FreeBSD : mozilla -- multiple vulnerabilities (f78eac48-c3d1-4666-8de5-63ceea25a578) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3477-2.NASL description USN-3477-1 fixed vulnerabilities in Firefox. The update caused search suggestions to not be displayed when performing Google searches from the search bar. This update fixes the problem. We apologize for the inconvenience. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, read uninitialized memory, obtain sensitive information, bypass same-origin restrictions, bypass CSP protections, bypass mixed content blocking, spoof the addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827, CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833, CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842) It was discovered that javascript: URLs pasted in to the addressbar would be executed instead of being blocked in some circumstances. If a user were tricked in to copying a specially crafted URL in to the addressbar, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7839) It was discovered that exported bookmarks do not strip script elements from user-supplied tags. If a user were tricked in to adding specially crafted tags to bookmarks, exporting them and then opening the resulting HTML file, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7840). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu 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 104807 published 2017-11-28 reporter Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104807 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 / 17.10 : firefox regression (USN-3477-2) NASL family Windows NASL id MOZILLA_FIREFOX_52_5_ESR.NASL description The version of Mozilla Firefox ESR installed on the remote Windows host is prior to 52.5. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes. last seen 2020-06-01 modified 2020-06-02 plugin id 104637 published 2017-11-16 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104637 title Mozilla Firefox ESR < 52.5 Multiple Vulnerabilities NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3477-1.NASL description Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, read uninitialized memory, obtain sensitive information, bypass same-origin restrictions, bypass CSP protections, bypass mixed content blocking, spoof the addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827, CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833, CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842) It was discovered that javascript: URLs pasted in to the addressbar would be executed instead of being blocked in some circumstances. If a user were tricked in to copying a specially crafted URL in to the addressbar, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7839) It was discovered that exported bookmarks do not strip script elements from user-supplied tags. If a user were tricked in to adding specially crafted tags to bookmarks, exporting them and then opening the resulting HTML file, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7840). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu 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 104652 published 2017-11-17 reporter Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104652 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 / 17.10 : firefox vulnerabilities (USN-3477-1) NASL family MacOS X Local Security Checks NASL id MACOSX_FIREFOX_57_0.NASL description The version of Mozilla Firefox installed on the remote macOS or Mac OS X host is prior to 57. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable application crashes. last seen 2020-06-01 modified 2020-06-02 plugin id 104636 published 2017-11-16 reporter This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104636 title Mozilla Firefox < 57 Multiple Vulnerabilities (macOS) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3477-3.NASL description USN-3477-1 fixed vulnerabilities in Firefox. The update introduced various minor regressions. This update fixes the problems. We apologize for the inconvenience. Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, read uninitialized memory, obtain sensitive information, bypass same-origin restrictions, bypass CSP protections, bypass mixed content blocking, spoof the addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827, CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833, CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842) It was discovered that javascript: URLs pasted in to the addressbar would be executed instead of being blocked in some circumstances. If a user were tricked in to copying a specially crafted URL in to the addressbar, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7839) It was discovered that exported bookmarks do not strip script elements from user-supplied tags. If a user were tricked in to adding specially crafted tags to bookmarks, exporting them and then opening the resulting HTML file, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7840). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu 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 104994 published 2017-12-04 reporter Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/104994 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 / 17.10 : firefox regressions (USN-3477-3)
References
- http://www.securityfocus.com/bid/101832
- http://www.securityfocus.com/bid/101832
- http://www.securitytracker.com/id/1039803
- http://www.securitytracker.com/id/1039803
- https://bugzilla.mozilla.org/show_bug.cgi?id=1366420
- https://bugzilla.mozilla.org/show_bug.cgi?id=1366420
- https://www.mozilla.org/security/advisories/mfsa2017-24/
- https://www.mozilla.org/security/advisories/mfsa2017-24/