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Mozilla Foundation Security Advisory 2017-20

Security vulnerabilities fixed in Thunderbird 52.3

Announced
August 18, 2017
Impact
critical
Products
Thunderbird
Fixed in
  • Thunderbird 52.3

In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts.

#CVE-2017-7800: Use-after-free in WebSockets during disconnection

Reporter
Looben Yang
Impact
critical
Description

A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash.

References

#CVE-2017-7801: Use-after-free with marquee during window resizing

Reporter
Nils
Impact
critical
Description

A use-after-free vulnerability can occur while re-computing layout for a marquee element during window resizing where the updated style object is freed while still in use. This results in a potentially exploitable crash.

References

#CVE-2017-7809: Use-after-free while deleting attached editor DOM node

Reporter
Nils
Impact
high
Description

A use-after-free vulnerability can occur when an editor DOM node is deleted prematurely during tree traversal while still bound to the document. This results in a potentially exploitable crash.

References

#CVE-2017-7784: Use-after-free with image observers

Reporter
Nils
Impact
high
Description

A use-after-free vulnerability can occur when reading an image observer during frame reconstruction after the observer has been freed. This results in a potentially exploitable crash.

References

#CVE-2017-7802: Use-after-free resizing image elements

Reporter
Nils
Impact
high
Description

A use-after-free vulnerability can occur when manipulating the DOM during the resize event of an image element. If these elements have been freed due to a lack of strong references, a potentially exploitable crash may occur when the freed elements are accessed.

References

#CVE-2017-7785: Buffer overflow manipulating ARIA attributes in DOM

Reporter
Nils
Impact
high
Description

A buffer overflow can occur when manipulating Accessible Rich Internet Applications (ARIA) attributes within the DOM. This results in a potentially exploitable crash.

References

#CVE-2017-7786: Buffer overflow while painting non-displayable SVG

Reporter
Nils
Impact
high
Description

A buffer overflow can occur when the image renderer attempts to paint non-displayable SVG elements. This results in a potentially exploitable crash.

References

#CVE-2017-7753: Out-of-bounds read with cached style data and pseudo-elements

Reporter
SkyLined
Impact
high
Description

An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data.

References

#CVE-2017-7787: Same-origin policy bypass with iframes through page reloads

Reporter
Oliver Wagner
Impact
high
Description

Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content on the top level page, leading to information disclosure.

References

#CVE-2017-7807: Domain hijacking through AppCache fallback

Reporter
Mathias Karlsson
Impact
high
Description

A mechanism that uses AppCache to hijack a URL in a domain using fallback by serving the files from a sub-path on the domain. This has been addressed by requiring fallback files be inside the manifest directory.

References

#CVE-2017-7792: Buffer overflow viewing certificates with an extremely long OID

Reporter
Fraser Tweedale
Impact
high
Description

A buffer overflow will occur when viewing a certificate in the certificate manager if the certificate has an extremely long object identifier (OID). This results in a potentially exploitable crash.

References

#CVE-2017-7804: Memory protection bypass through WindowsDllDetourPatcher

Reporter
Stephen Fewer
Impact
high
Description

The destructor function for the WindowsDllDetourPatcher class can be re-purposed by malicious code in concert with another vulnerability to write arbitrary data to an attacker controlled location in memory. This can be used to bypass existing memory protections in this situation.
Note: This attack only affects Windows operating systems. Other operating systems are not affected.

References

#CVE-2017-7791: Spoofing following page navigation with data: protocol and modal alerts

Reporter
Jose María Acuña
Impact
moderate
Description

On pages containing an iframe, the data: protocol can be used to create a modal alert that will render over arbitrary domains following page navigation, spoofing of the origin of the modal alert from the iframe content.

References

#CVE-2017-7782: WindowsDllDetourPatcher allocates memory without DEP protections

Reporter
Arthur Edelstein
Impact
moderate
Description

An error in the WindowsDllDetourPatcher where a RWX ("Read/Write/Execute") 4k block is allocated but never protected, violating DEP protections.
Note: This attack only affects Windows operating systems. Other operating systems are not affected.

References

#CVE-2017-7803: CSP containing 'sandbox' improperly applied

Reporter
Rhys Enniks
Impact
moderate
Description

When a page’s content security policy (CSP) header contains a sandbox directive, other directives are ignored. This results in the incorrect enforcement of CSP.

References

#CVE-2017-7779: Memory safety bugs fixed in Firefox 55, Firefox ESR 52.3, and Thunderbird 52.3

Reporter
Mozilla developers and community
Impact
critical
Description

Mozilla developers and community members Masayuki Nakano, Gary Kwong, Ronald Crane, Andrew McCreight, Tyson Smith, Bevis Tseng, Christian Holler, Bryce Van Dyk, Dragana Damjanovic, Kartikaya Gupta, Philipp, Tristan Bourvon, and Andi-Bogdan Postelnicu reported memory safety bugs present in Firefox 54, Firefox ESR 52.2, and Thunderbird 52.2. 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.

References