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CVE-2019-11761: Security vulnerabilities fixed in - Thunderbird 68.2

By using a form with a data URI it was possible to gain access to the privileged JSONView object that had been cloned into content. Impact from exposing this object appears to be minimal, however it was a bypass of existing defense in depth mechanisms. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVE
#xss#vulnerability#web#mac#js#buffer_overflow#firefox

Mozilla Foundation Security Advisory 2019-35

Announced

October 22, 2019

Impact

critical

Products

Thunderbird

Fixed in

  • Thunderbird 68.2

#CVE-2019-15903: Heap overflow in expat library in XML_GetCurrentLineNumber

Reporter

Sebastian Pipping

Impact

high

Description

In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early. A subsequent call to XML_GetCurrentLineNumber or XML_GetCurrentColumnNumber then resulted in a heap-based buffer over-read.

References

  • Bug 1584907

#CVE-2019-11757: Use-after-free when creating index updates in IndexedDB

Reporter

Zhanjia Song

Impact

high

Description

When following the value’s prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash.

References

  • Bug 1577107

#CVE-2019-11758: Potentially exploitable crash due to 360 Total Security

Reporter

Mozilla developers and community

Impact

high

Description

Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total Security was installed. This bug showed evidence of memory corruption in the accessibility engine and we presume that with enough effort that it could be exploited to run arbitrary code.

References

  • Bug 1536227

#CVE-2019-11759: Stack buffer overflow in HKDF output

Reporter

Guido Vranken

Impact

moderate

Description

An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash.

References

  • Bug 1577953

#CVE-2019-11760: Stack buffer overflow in WebRTC networking

Reporter

Nils

Impact

moderate

Description

A fixed-size stack buffer could overflow in nrappkit when doing WebRTC signaling. This resulted in a potentially exploitable crash in some instances.

References

  • Bug 1577719

#CVE-2019-11761: Unintended access to a privileged JSONView object

Reporter

Cody Crews

Impact

moderate

Description

By using a form with a data URI it was possible to gain access to the privileged JSONView object that had been cloned into content. Impact from exposing this object appears to be minimal, however it was a bypass of existing defense in depth mechanisms.

References

  • Bug 1561502

#CVE-2019-11762: document.domain-based origin isolation has same-origin-property violation

Reporter

Kris Maglione

Impact

moderate

Description

If two same-origin documents set document.domain differently to become cross-origin, it was possible for them to call arbitrary DOM methods/getters/setters on the now-cross-origin window.

References

  • Bug 1582857

#CVE-2019-11763: Incorrect HTML parsing results in XSS bypass technique

Reporter

Gareth Heyes

Impact

moderate

Description

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters.

References

  • Bug 1584216

#CVE-2019-11764: Memory safety bugs fixed in Thunderbird 68.2

Reporter

Mozilla developers and community

Impact

critical

Description

Mozilla developers and community members Bob Clary, Jason Kratzer, Aaron Klotz, Iain Ireland, Tyson Smith, Christian Holler, Steve Fink, Honza Bambas, Byron Campen, and Cristian Brindusan reported memory safety bugs present in Firefox 69 and Firefox ESR 68.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could be exploited to run arbitrary code.

References

  • Memory safety bugs fixed in Firefox 70 and Firefox ESR 68.2

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CVE-2019-15903: [CVE-2019-15903] Deny internal entities closing the doctype (for #317) by hartwork · Pull Request #318 · libexpat/libexpat

In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early; a consecutive call to XML_GetCurrentLineNumber (or XML_GetCurrentColumnNumber) then resulted in a heap-based buffer over-read.

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