CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
80.6%
A use-after-free vulnerability can occur when flushing and resizing layout because the PressShell object has been freed while still in use. This results in a potentially exploitable crash during these operations.
The Resource Timing API incorrectly revealed navigations in cross-origin iframes. This is a same-origin policy violation and could allow for data theft of URLs loaded by users.
A vulnerability where the security wrapper does not deny access to some exposed properties using the deprecated exposedProps mechanism on proxy objects. These properties should be explicitly unavailable to proxy objects.
The combined, single character, version of the letter βiβ with any of the potential accents in unicode, such as acute or grave, can be spoofed in the addressbar by the dotless version of βiβ 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.
Some Arabic and Indic vowel marker characters can be combined with Latin characters in a domain name to eclipse the non-Latin character with some font sets on the addressbar. The non-Latin character will not be visible to most viewers. This allows for domain spoofing attacks because these combined domain names do not display as punycode.
A data: URL loaded in a new tab did not inherit the Content Security Policy (CSP) of the original page, allowing for bypasses of the policy including the execution of JavaScript. In prior versions when data: documents also inherited the context of the original page this would allow for potential cross-site scripting (XSS) attacks.
Mixed content blocking of insecure (HTTP) sub-resources in a secure (HTTPS) document was not correctly applied for resources that redirect from HTTPS to HTTP, allowing content that should be blocked, such as scripts, to be loaded on a page.
The βpingsenderβ executable used by the Firefox Health Report dynamically loads a system copy of libcurl, which an attacker could replace. This allows for privilege escalation as the replaced libcurl code will run with Firefoxβs privileges. Note: This attack requires an attacker have local system access and only affects OS X and Linux. Windows systems are not affected.
SVG loaded through tags can use tags within the SVG data to set cookies for that page.
Punycode format text will be displayed for entire qualified international domain names in some instances when a sub-domain triggers the punycode display instead of the primary domain being displayed in native script and the sub-domain only displaying as punycode. This could be used for limited spoofing attacks due to user confusion.
Control characters prepended before javascript: URLs pasted in the addressbar can cause the leading characters to be ignored and the pasted JavaScript to be executed instead of being blocked. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks where users are convinced to copy and paste text into the addressbar.
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.
If a documentβs Referrer Policy attribute is set to βno-referrerβ sometimes two network requests are made for elements instead of one. One of these requests includes the referrer instead of respecting the set policy to not include a referrer on requests.
Mozilla developers and community members Boris Zbarsky, Carsten Book, Christian Holler, Byron Campen, Jan de Mooij, Jason Kratzer, Jesse Schwartzentruber, Marcia Knous, Randell Jesup, Tyson Smith, and Ting-Yu Chou reported memory safety bugs present in Firefox 56. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.
Mozilla developers and community members Christian Holler, David Keeler, Jon Coppeard, Julien Cristau, Jan de Mooij, Jason Kratzer, Philipp, Nicholas Nethercote, Oriol Brufau, AndrΓ© Bargull, Bob Clary, Jet Villegas, Randell Jesup, Tyson Smith, Gary Kwong, and Ryan VanderMeulen reported memory safety bugs present in Firefox 56 and Firefox ESR 52.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.
bugzilla.mozilla.org/buglist.cgi?bug_id=1394530%2C1369561%2C1411458%2C1400003%2C1395138%2C1408412%2C1393840%2C1400763%2C1339259%2C1394265%2C1407740%2C1407751%2C1408005%2C1406398%2C1387799%2C1261175%2C1400554%2C1375146%2C1397811%2C1404636%2C1401804
bugzilla.mozilla.org/buglist.cgi?bug_id=1399922%2C1403646%2C1403716%2C1365894%2C1402876%2C1406154%2C1384121%2C1384615%2C1407375%2C1339485%2C1361432%2C1394031%2C1383019%2C1407032%2C1387845%2C1386490
bugzilla.mozilla.org/show_bug.cgi?id=1325923
bugzilla.mozilla.org/show_bug.cgi?id=1358009
bugzilla.mozilla.org/show_bug.cgi?id=1366420
bugzilla.mozilla.org/show_bug.cgi?id=1370497
bugzilla.mozilla.org/show_bug.cgi?id=1392026
bugzilla.mozilla.org/show_bug.cgi?id=1397064
bugzilla.mozilla.org/show_bug.cgi?id=1399540
bugzilla.mozilla.org/show_bug.cgi?id=1401339
bugzilla.mozilla.org/show_bug.cgi?id=1402363
bugzilla.mozilla.org/show_bug.cgi?id=1402896
bugzilla.mozilla.org/show_bug.cgi?id=1406750
bugzilla.mozilla.org/show_bug.cgi?id=1408782
bugzilla.mozilla.org/show_bug.cgi?id=1408990
bugzilla.mozilla.org/show_bug.cgi?id=1412252
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
80.6%