Vulnerabilities > CVE-2017-7794 - Incorrect Default Permissions vulnerability in Mozilla Firefox
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
On Linux systems, if the content process is compromised, the sandbox broker will allow files to be truncated even though the sandbox explicitly only has read access to the local file system and no write permissions. Note: This attack only affects the Linux operating system. Other operating systems are not affected. This vulnerability affects Firefox < 55.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Accessing Functionality Not Properly Constrained by ACLs In applications, particularly web applications, access to functionality is mitigated by the authorization framework, whose job it is to map ACLs to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application or can run queries for data that he is otherwise not supposed to.
- Directory Indexing An adversary crafts a request to a target that results in the target listing/indexing the content of a directory as output. One common method of triggering directory contents as output is to construct a request containing a path that terminates in a directory name rather than a file name since many applications are configured to provide a list of the directory's contents when such a request is received. An adversary can use this to explore the directory tree on a target as well as learn the names of files. This can often end up revealing test files, backup files, temporary files, hidden files, configuration files, user accounts, script contents, as well as naming conventions, all of which can be used by an attacker to mount additional attacks.
- Footprinting An attacker engages in probing and exploration activity to identify constituents and properties of the target. Footprinting is a general term to describe a variety of information gathering techniques, often used by attackers in preparation for some attack. It consists of using tools to learn as much as possible about the composition, configuration, and security mechanisms of the targeted application, system or network. Information that might be collected during a footprinting effort could include open ports, applications and their versions, network topology, and similar information. While footprinting is not intended to be damaging (although certain activities, such as network scans, can sometimes cause disruptions to vulnerable applications inadvertently) it may often pave the way for more damaging attacks.
- 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.
- Web Logs Tampering Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.
Nessus
NASL family MacOS X Local Security Checks NASL id MACOSX_FIREFOX_55_0.NASL description The version of Mozilla Firefox installed on the remote macOS or Mac OS X host is prior to 55. 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 102357 published 2017-08-10 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/102357 title Mozilla Firefox < 55 Multiple Vulnerabilities (macOS) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(102357); script_version("1.5"); script_cvs_date("Date: 2019/11/12"); script_cve_id( "CVE-2017-7753", "CVE-2017-7779", "CVE-2017-7780", "CVE-2017-7781", "CVE-2017-7782", "CVE-2017-7783", "CVE-2017-7784", "CVE-2017-7785", "CVE-2017-7786", "CVE-2017-7787", "CVE-2017-7788", "CVE-2017-7789", "CVE-2017-7791", "CVE-2017-7792", "CVE-2017-7794", "CVE-2017-7797", "CVE-2017-7798", "CVE-2017-7799", "CVE-2017-7800", "CVE-2017-7801", "CVE-2017-7802", "CVE-2017-7803", "CVE-2017-7806", "CVE-2017-7807", "CVE-2017-7808", "CVE-2017-7809" ); script_bugtraq_id( 100196, 100197, 100198, 100199, 100201, 100202, 100203, 100206 ); script_xref(name:"MFSA", value:"2017-18"); script_name(english:"Mozilla Firefox < 55 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 installed on the remote macOS or Mac OS X host is prior to 55. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable application crashes."); script_set_attribute(attribute:"see_also", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/"); script_set_attribute(attribute:"solution", value: "Upgrade to Mozilla Firefox version 55 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:POC/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:P/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-7779"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2017/08/08"); script_set_attribute(attribute:"patch_publication_date", value:"2017/08/08"); script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/10"); 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:"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/Installed"); 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); if (get_kb_item(kb_base + '/is_esr')) exit(0, 'The Mozilla Firefox installation is in the ESR branch.'); mozilla_check_version(product:'firefox', version:version, path:path, esr:FALSE, fix:'55', severity:SECURITY_HOLE);
NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3391-1.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 conduct cross-site scripting (XSS) attacks, bypass sandbox restrictions, obtain sensitive information, spoof the origin of modal alerts, bypass same origin restrictions, read uninitialized memory, cause a denial of service via program crash or hang, or execute arbitrary code. (CVE-2017-7753, CVE-2017-7779, CVE-2017-7780, CVE-2017-7781, CVE-2017-7783, CVE-2017-7784, CVE-2017-7785, CVE-2017-7786, CVE-2017-7787, CVE-2017-7788, CVE-2017-7789, CVE-2017-7791, CVE-2017-7792, CVE-2017-7794, CVE-2017-7797, CVE-2017-7798, CVE-2017-7799, CVE-2017-7800, CVE-2017-7801, CVE-2017-7802, CVE-2017-7803, CVE-2017-7806, CVE-2017-7807, CVE-2017-7808, CVE-2017-7809). 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 102523 published 2017-08-16 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/102523 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : firefox vulnerabilities (USN-3391-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3391-3.NASL description USN-3391-1 fixed vulnerabilities in Firefox. The update introduced a performance regression with WebExtensions. 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 conduct cross-site scripting (XSS) attacks, bypass sandbox restrictions, obtain sensitive information, spoof the origin of modal alerts, bypass same origin restrictions, read uninitialized memory, cause a denial of service via program crash or hang, or execute arbitrary code. (CVE-2017-7753, CVE-2017-7779, CVE-2017-7780, CVE-2017-7781, CVE-2017-7783, CVE-2017-7784, CVE-2017-7785, CVE-2017-7786, CVE-2017-7787, CVE-2017-7788, CVE-2017-7789, CVE-2017-7791, CVE-2017-7792, CVE-2017-7794, CVE-2017-7797, CVE-2017-7798, CVE-2017-7799, CVE-2017-7800, CVE-2017-7801, CVE-2017-7802, CVE-2017-7803, CVE-2017-7806, CVE-2017-7807, CVE-2017-7808, CVE-2017-7809). 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 102580 published 2017-08-18 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/102580 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : firefox regression (USN-3391-3) NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_555B244E6B204546851FD8EB7D6C1FFA.NASL description Mozilla Foundation reports : Please reference CVE/URL list for details last seen 2020-06-01 modified 2020-06-02 plugin id 102278 published 2017-08-09 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/102278 title FreeBSD : mozilla -- multiple vulnerabilities (555b244e-6b20-4546-851f-d8eb7d6c1ffa) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3391-2.NASL description USN-3391-1 fixed vulnerabilities in Firefox. This update provides the corresponding update for Ubufox. 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 conduct cross-site scripting (XSS) attacks, bypass sandbox restrictions, obtain sensitive information, spoof the origin of modal alerts, bypass same origin restrictions, read uninitialized memory, cause a denial of service via program crash or hang, or execute arbitrary code. (CVE-2017-7753, CVE-2017-7779, CVE-2017-7780, CVE-2017-7781, CVE-2017-7783, CVE-2017-7784, CVE-2017-7785, CVE-2017-7786, CVE-2017-7787, CVE-2017-7788, CVE-2017-7789, CVE-2017-7791, CVE-2017-7792, CVE-2017-7794, CVE-2017-7797, CVE-2017-7798, CVE-2017-7799, CVE-2017-7800, CVE-2017-7801, CVE-2017-7802, CVE-2017-7803, CVE-2017-7806, CVE-2017-7807, CVE-2017-7808, CVE-2017-7809). 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 102543 published 2017-08-17 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/102543 title Ubuntu 14.04 LTS / 16.04 LTS / 17.04 : ubufox update (USN-3391-2) NASL family Windows NASL id MOZILLA_FIREFOX_55_0.NASL description The version of Mozilla Firefox installed on the remote Windows host is prior to 55. 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 102359 published 2017-08-10 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/102359 title Mozilla Firefox < 55 Multiple Vulnerabilities
References
- http://www.securitytracker.com/id/1039124
- http://www.securitytracker.com/id/1039124
- https://bugzilla.mozilla.org/show_bug.cgi?id=1374281
- https://bugzilla.mozilla.org/show_bug.cgi?id=1374281
- https://www.mozilla.org/security/advisories/mfsa2017-18/
- https://www.mozilla.org/security/advisories/mfsa2017-18/