Vulnerabilities > CVE-2017-7832 - Improper Input Validation vulnerability in Mozilla Firefox
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
LOW Availability impact
NONE Summary
The combined, single character, version of the letter 'i' with any of the potential accents in unicode, such as acute or grave, can be spoofed in the addressbar by the dotless version of 'i' followed by the same accent as a second character with most font sets. This allows for domain spoofing attacks because these combined domain names do not display as punycode. This vulnerability affects Firefox < 57.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- 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.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
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)