Ambiguous IPv6 in Origin headers may bypass webserver access restrictions — Mozilla

Security researcher Simone Fabiano reported that if a cross-site XHR or WebSocket is opened on a web server on a non-standard port for web traffic while using an IPv6 address, the browser will send an ambiguous origin headers if the IPv6 address contains at least 2 consecutive 16-bit fields of...

Invalid frees causes heap corruption in gfxImageSurface — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG found a heap corruption in gfxImageSurface which allows for invalid frees and possible remote code execution. This happens due to float error, resulting from graphics values being passed through different number system...

HTTP Redirections and remote content can be read by javascript errors — Mozilla

Security researcher Daniel Divricean reported that a defect in the error handling of javascript errors can leak the file names and location of javascript files on a server, leading to inadvertent information disclosure and a vector for further attacks...

Crash with WebGL content using textImage2D — Mozilla

Mozilla community member Ms2ger found an image rendering issue with WebGL when texImage2D uses use JSVALTOOBJECT on arbitrary objects. This can lead to a crash on a maliciously crafted web page. While there is no evidence that this is directly exploitable, there is a possibility of remote code...

Page load short-circuit can lead to XSS — Mozilla

Security researchers Jordi Chancel and Eddy Bordi reported that they could short-circuit page loads to show the address of a different site than what is loaded in the window in the addressbar. Security researcher Chris McGowen independently reported the same flaw, and further demonstrated that th...

Potential XSS via multibyte content processing errors — Mozilla

Anne van Kesteren of Opera Software found a multi-octet encoding issue where certain octets will destroy the following octets in the processing of some multibyte character sets. This can leave users vulnerable to cross-site scripting XSS attacks on maliciously crafted web pages...

Potential memory corruption during font rendering using cairo-dwrite — Mozilla

Security research firm iDefense reported that researcher wushi of team509 discovered a memory corruption on Windows Vista and Windows 7 systems with hardware acceleration disabled or using incompatible video drivers. This is created by using cairo-dwrite to attempt to render fonts on an unsupport...

Potential site identity spoofing when loading RSS and Atom feeds — Mozilla

Security researcher Jeroen van der Gun reported that if RSS or Atom XML invalid content is loaded over HTTPS, the addressbar updates to display the new location of the loaded resource, including SSL indicators, while the main window still displays the previously loaded content. This allows for...

Off-by-one error in OpenType Sanitizer — Mozilla

Mateusz Jurczyk of the Google Security Team discovered an off-by-one error in the OpenType Sanitizer using the Address Sanitizer tool. This can lead to an out-of-bounds read and execution of an uninitialized function pointer during parsing and possible remote code execution...

use-after-free in IDBKeyRange — Mozilla

Using the Address Sanitizer tool, security researcher Aki Helin from OUSPG found that IDBKeyRange of indexedDB remains in the XPConnect hashtable instead of being unlinked before being destroyed. When it is destroyed, this causes a use-after-free, which is potentially exploitable...

Multiple security flaws fixed in FreeType v2.4.9 — Mozilla

Mateusz Jurczyk of the Google Security Team used the Address Sanitizer tool to discover a series of memory safety bugs in the FreeType library, some of which could cause memory corruption and exploitable crashes with certain fonts and font parsing. Firefox Mobile has been upgraded to FreeType...

Miscellaneous memory safety hazards (rv:12.0/ rv:10.0.4) — Mozilla

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be...

Crash when accessing keyframe cssText after dynamic modification — Mozilla

Mozilla community member Daniel Glazman of Disruptive Innovations reported a crash when accessing a keyframe's cssText after dynamic modification. This crash may be potentially exploitable...

XSS with Drag and Drop and Javascript: URL — Mozilla

Firefox prevents the dropping of javascript: links onto a frame to prevent malicious sites from tricking users into performing a cross-site scripting XSS attacks on themselves. Security researcher Soroush Dalili reported a way to bypass this protection...

Miscellaneous memory safety hazards (rv:11.0/ rv:10.0.3 / rv:1.9.2.28) — Mozilla

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be...

XSS with multiple Content Security Policy headers — Mozilla

Security Researcher Mike Brooks of Sitewatch reported that if multiple Content Security Policy CSP headers are present on a page, they have an additive effect page policy. Using carriage return line feed CRLF injection, a new CSP rule can be introduced which allows for cross-site scripting XSS on...

Escalation of privilege with Javascript: URL as home page — Mozilla

Security researcher Mariusz Mlynski reported that an attacker able to convince a potential victim to set a new home page by dragging a link to the "home" button can set that user's home page to a javascript: URL. Once this is done the attacker's page can cause repeated crashes of the browser,...

Use-after-free in shlwapi.dll — Mozilla

Security researchers Blair Strang and Scott Bell of Security Assessment found that when a parent window spawns and closes a child window that uses the file open dialog, a crash can be induced in shlwapi.dll on 32-bit Windows 7 systems. This crash may be potentially exploitable...

window.fullScreen writeable by untrusted content — Mozilla

Mozilla developer Matt Brubeck reported that window.fullScreen is writeable by untrusted content now that the DOM fullscreen API is enabled. Because window.fullScreen does not include mozRequestFullscreen's security protections, it could be used for UI spoofing. This code change makes...

SVG issues found with Address Sanitizer — Mozilla

Security researcher Atte Kettunen from OUSPG found two issues with Firefox's handling of SVG using the Address Sanitizer tool. The first issue, critically rated, is a use-after-free in SVG animation that could potentially lead to arbitrary code execution. The second issue is rated moderate and is...

libpng integer overflow — Mozilla

An integer overflow in the libpng library can lead to a heap-buffer overflow when decompressing certain PNG images. This leads to a crash, which may be potentially exploitable...

use after free in nsXBLDocumentInfo::ReadPrototypeBindings — Mozilla

Mozilla developers Andrew McCreight and Olli Pettay found that ReadPrototypeBindings will leave a XBL binding in a hash table even when the function fails. If this occurs, when the cycle collector reads this hash table and attempts to do a virtual method on this binding a crash will occur. This...

Child nodes from nsDOMAttribute still accessible after removal of nodes — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that removed child nodes of nsDOMAttribute can be accessed under certain circumstances because of a premature notification of AttributeChildRemoved. This use-after-free of the child nodes could possibly allow for remot...

<iframe> element exposed across domains via name attribute — Mozilla

Vitaly Nevgen reported that an attacker could replace a sub-frame in another domain's document by using the name attribute of the sub-frame as a form submission target. This can potentially allow for phishing attacks against users and violates the HTML5 frame navigation policy...

Frame scripts calling into untrusted objects bypass security checks — Mozilla

Mozilla security researcher mozbugra4 reported that frame scripts bypass XPConnect security checks when calling untrusted objects. This allows for cross-site scripting XSS attacks through web pages and Firefox extensions. The fix enables the Script Security Manager SSM to force security checks on...

Uninitialized memory appended when encoding icon images may cause information disclosure — Mozilla

Mozilla developer Tim Abraldes reported that when encoding images as image/vnd.microsoft.icon the resulting data was always a fixed size, with uninitialized memory appended as padding beyond the size of the actual image. This is the result of mImageBufferSize in the encoder being initialized with...

Overly permissive IPv6 literal syntax — Mozilla

For historical reasons Firefox has been generous in its interpretation of web addresses containing square brackets around the host. If this host was not a valid IPv6 literal address, Firefox attempted to interpret the host as a regular domain name. Gregory Fleischer reported that requests made...

Crash with malformed embedded XSLT stylesheets — Mozilla

Security researchers Nicolas Grégoire and Aki Helin independently reported that when processing a malformed embedded XSLT stylesheet, Firefox can crash due to a memory corruption. While there is no evidence that this is directly exploitable, there is a possibility of remote code execution...

Miscellaneous memory safety hazards (rv:10.0/ 1.9.2.26) — Mozilla

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be...

Firefox Recovery Key.html is saved with unsafe permission — Mozilla

magicant starmen reported that if a user chooses to export their Firefox Sync key the "Firefox Recovery Key.html" file is saved with incorrect permissions, making the file contents potentially readable by other users on Linux and OS X systems...

Potential Memory Corruption When Decoding Ogg Vorbis files — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative the possibility of memory corruption during the decoding of Ogg Vorbis files. This can cause a crash during decoding and has the potential for remote code execution...

.jar not treated as executable in Firefox 3.6 on Mac — Mozilla

Part of the fix for MFSA 2011-40, reported by Mariusz Mlynski, was to treat .jar files as executables. This is necessary because Java treats downloaded .jar files as fully-featured "Applications" rather than restricting them to the limited privileges of in-browser "Applets". The fix taken in...

nsSVGValue out-of-bounds access — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that a flaw in the Mozilla SVG implementation could result in an out-of-bounds memory access if SVG elements were removed during a DOMAttrModified event handler...

Crash scaling <video> to extreme sizes — Mozilla

sczimmer reported a crash when scaling an OGG element to extreme sizes...

Key detection without JavaScript via SVG animation — Mozilla

Security researcher Mario Heiderich reported it was possible to use SVG animation accessKey events to detect key strokes even when JavaScript was disabled. Since web pages can normally detect key events through script and most users have scripting enabled this does not present a risk for most...

Potentially exploitable crash in the YARR regular expression library — Mozilla

Security researcher Aki Helin reported a crash in the YARR regular expression library that could be triggered by javascript in web content...

Miscellaneous memory safety hazards (rv:9.0) — Mozilla

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be...

Crash when plugin removes itself on Mac OS X — Mozilla

FireBreath developer Richard Bateman reported a crash on Mac OS X that occurred when a plugin deletes its containing DOM frame during a call from that frame. The observed symptom is a null dereference but we cannot rule out the possibility that content from a scriptable plugin such as Flash could...

loadSubScript unwraps XPCNativeWrapper scope parameter (1.9.2 branch) — Mozilla

Mozilla security researcher mozbugra4 reported that the problem described in MFSA 2011-43 and fixed in Firefox 7 also affected Firefox 3.6: a malicious page could potentially exploit a Firefox user who had installed an add-on that used loadSubscript in vulnerable ways...

Cross-origin data theft using canvas and Windows D2D — Mozilla

Mozilla developer Bas Schouten reported that the introduction of the "Azure" graphics back-end on Windows in Firefox 7 re-introduced the cross-origin data theft issue reported by nasalislarvatus3000 as described in MFSA 2011-29...

Miscellaneous memory safety hazards (rv:8.0) — Mozilla

Mozilla developers fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run...

Code execution via NoWaiverWrapper — Mozilla

Mozilla security researcher mozbugra4 reported that an internal privilege check failed to respect the NoWaiverWrappers introduced with Firefox 4. This could result in elevated privilege being granted to web content...

Memory corruption while profiling using Firebug — Mozilla

Marc Schoenefeld reported a crash when using Firebug to profile a JavaScript file with many functions. It may be possible to trigger this crash without the use of debugging APIs, and if so this could be exploitable...

Cross-origin image theft on Mac with integrated Intel GPU — Mozilla

Claus Wahlers reported that random images from GPU memory were showing up in WebGL textures. Once incorporated into the WebGL graphics it is possible for a site to programmatically read the image data and potentially gain sensitive data from other things that had been displayed earlier. This...

Potential XSS against sites using Shift-JIS — Mozilla

Yosuke Hasegawa reported that the Mozilla browser engine mishandled invalid sequences in the Shift-JIS encoding. When encountering an invalid pair Mozilla would turn the entire two-byte sequence into a single unknown character rather than an unknown character followed by a valid single-byte...

Code installation through holding down Enter — Mozilla

Mariusz Mlynski reported that if you could convince a user to hold down the Enter key--as part of a game or test, perhaps--a malicious page could pop up a download dialog where the held key would then activate the default Open action. For some file types this would be merely annoying the equivale...

Defense against multiple Location headers due to CRLF Injection — Mozilla

Ian Graham of Citrix Online reported that when multiple Location headers were present in a redirect response Mozilla behavior differed from other browsers: Mozilla would use the second Location header while Chrome and Internet Explorer would use the first. Two copies of this header with different...

Inferring keystrokes from motion data — Mozilla

University of California, Davis researchers Liang Cai and Hao Chen presented a paper at the 2011 USENIX HotSec workshop on inferring keystrokes from device motion data on mobile devices. Web pages can now receive data similar to the apps studied in that paper and likely present a similar risk. We...

Potentially exploitable crash in the YARR regular expression library — Mozilla

Security researcher Aki Helin reported a potentially exploitable crash in the YARR regular expression library used by JavaScript...

Miscellaneous memory safety hazards (rv:7.0 / rv:1.9.2.23) — Mozilla

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be...