Arch Linux Security Advisory ASA-201910-16
=========================================
Severity: Critical
Date    : 2019-10-26
CVE-ID  : CVE-2018-6156  CVE-2019-11757 CVE-2019-11759 CVE-2019-11760
          CVE-2019-11761 CVE-2019-11762 CVE-2019-11763 CVE-2019-11764
          CVE-2019-11765 CVE-2019-15903 CVE-2019-17000 CVE-2019-17001
          CVE-2019-17002
Package : firefox
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1055

Summary
======
The package firefox before version 70.0-1 is vulnerable to multiple
issues including arbitrary code execution, access restriction bypass,
denial of service, insufficient validation and same-origin policy
bypass.

Resolution
=========
Upgrade to 70.0-1.

# pacman -Syu "firefox>=70.0-1"

The problems have been fixed upstream in version 70.0.

Workaround
=========
None.

Description
==========
- CVE-2018-6156 (arbitrary code execution)

A heap-based buffer overflow has been found in Firefox before 70.0,
where an incorrect derivation of a packet length in WebRTC caused heap
corruption via a crafted video file.

- CVE-2019-11757 (arbitrary code execution)

A use-after-free issue has been found in the IndexedDB component of
Firefox before 70.0 and Thunderbird before 68.2. When storing a value
in IndexedDB, the value's prototype chain is followed and it was
possible to retain a reference to a locale, delete it, and subsequently
reference it.

- CVE-2019-11759 (arbitrary code execution)

A stack-based buffer overflow has been found in the HKDF output of
Firefox before 70.0 and Thunderbird before 68.2. An attacker could have
caused 4 bytes of HMAC output to be written past the end of a buffer
stored on the stack.

- CVE-2019-11760 (arbitrary code execution)

A fixed-size stack buffer overflow has been found in nrappkit, in the
WebRTC signaling code of Firefox before 70.0 and Thunderbird before
68.2.

- CVE-2019-11761 (access restriction bypass)

An issue has been found in Firefox before 70.0 and Thunderbird before
68.2, where 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.

- CVE-2019-11762 (same-origin policy bypass)

A same-origin policy bypass has been found in Firefox before 70.0 and
Thunderbird before 68.2 where, 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.

- CVE-2019-11763 (insufficient validation)

An issue has been found in Firefox before 70.0 and Thunderbird before
68.2, where failure to correctly handle null bytes when processing HTML
entities resulted in 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.

- CVE-2019-11764 (arbitrary code execution)

Several memory safety bugs have been found in Firefox before 70.0 and
Thunderbird before 68.2. Some of these bugs showed evidence of memory
corruption and Mozilla presumes that with enough effort some of these
could be exploited to run arbitrary code.

- CVE-2019-11765 (insufficient validation)

Incorrect permissions could be granted to a website in Firefox before
70.0. A compromised content process could send a message to the parent
process that would cause the 'Click to Play' permission prompt to be
shown. However, due to lack of validation from the parent process, if
the user accepted the permission request an attacker-controlled
permission would be granted rather than the 'Click to Play' permission.

- CVE-2019-15903 (denial of service)

A security issue has been found in libexpat before 2.2.8, where 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

- CVE-2019-17000 (access restriction bypass)

A CSP bypass has been found in Firefox 69, where an object tag with a
data URI did not correctly inherit the document's Content Security
Policy. This allowed a CSP bypass in a cross-origin frame if the
document's policy explicitly allowed data: URIs.

- CVE-2019-17001 (access restriction bypass)

A CSP bypass has been found in Firefox 69, where a Content-Security-Policy that blocks in-line scripts could be bypassed using an object
tag to execute JavaScript in the protected document (cross-site
scripting). This is a separate bypass from CVE-2019-17000.

- CVE-2019-17002 (access restriction bypass)

An issue has been found in Firefox before 70.0 where, if upgrade-insecure-requests was specified in the Content Security Policy, and a
link was dragged and dropped from that page, the link was not upgraded
to https.

Impact
=====
A remote attacker can crash Firefox, bypass security measures or
execute arbitrary code.

References
=========
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2018-6156
https://bugzilla.mozilla.org/show_bug.cgi?id=1480088
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11757
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11757
https://bugzilla.mozilla.org/show_bug.cgi?id=1577107
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11759
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11759
https://bugzilla.mozilla.org/show_bug.cgi?id=1577953
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11760
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11760
https://bugzilla.mozilla.org/show_bug.cgi?id=1577719
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11761
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11761
https://bugzilla.mozilla.org/show_bug.cgi?id=1561502
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11762
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11762
https://bugzilla.mozilla.org/show_bug.cgi?id=1582857
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11763
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11763
https://bugzilla.mozilla.org/show_bug.cgi?id=1584216
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11764
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11764
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1558522%2C1577061%2C1548044%2C1571223%2C1573048%2C1578933%2C1575217%2C1583684%2C1586845%2C1581950%2C1583463%2C1586599
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11765
https://bugzilla.mozilla.org/show_bug.cgi?id=1562582
https://chromereleases.googleblog.com/2019/10/stable-channel-update-for-desktop_22.html
https://github.com/libexpat/libexpat/issues/317
https://github.com/libexpat/libexpat/pull/318
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-17000
https://bugzilla.mozilla.org/show_bug.cgi?id=1441468
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-17001
https://bugzilla.mozilla.org/show_bug.cgi?id=1587976
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-17002
https://bugzilla.mozilla.org/show_bug.cgi?id=1561056
https://security.archlinux.org/CVE-2018-6156
https://security.archlinux.org/CVE-2019-11757
https://security.archlinux.org/CVE-2019-11759
https://security.archlinux.org/CVE-2019-11760
https://security.archlinux.org/CVE-2019-11761
https://security.archlinux.org/CVE-2019-11762
https://security.archlinux.org/CVE-2019-11763
https://security.archlinux.org/CVE-2019-11764
https://security.archlinux.org/CVE-2019-11765
https://security.archlinux.org/CVE-2019-15903
https://security.archlinux.org/CVE-2019-17000
https://security.archlinux.org/CVE-2019-17001
https://security.archlinux.org/CVE-2019-17002