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Firefox Privacy Notice

Mozilla Foundation Security Advisory 2018-13

Security vulnerabilities fixed in Thunderbird 52.8

Announced
May 18, 2018
Impact
critical
Products
Thunderbird
Fixed in
  • Thunderbird 52.8

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-2018-5183: Backport critical security fixes in Skia

Reporter
Mozilla Developers
Impact
critical
Description

Mozilla developers backported selected changes in the Skia library. These changes correct memory corruption issues including invalid buffer reads and writes during graphic operations.

References

#CVE-2018-5184: Full plaintext recovery in S/MIME via chosen-ciphertext attack

Reporter
Damian Poddebniak, Christian Dresen, Jens Müller, Fabian Ising, Sebastian Schinzel, Simon Friedberger, Juraj Somorovsky, Jörg Schwenk
Impact
high
Description

Using remote content in encrypted messages can lead to the disclosure of plaintext.

References

#CVE-2018-5154: Use-after-free with SVG animations and clip paths

Reporter
Nils
Impact
high
Description

A use-after-free vulnerability can occur while enumerating attributes during SVG animations with clip paths. This results in a potentially exploitable crash.

References

#CVE-2018-5155: Use-after-free with SVG animations and text paths

Reporter
Nils
Impact
high
Description

A use-after-free vulnerability can occur while adjusting layout during SVG animations with text paths. This results in a potentially exploitable crash.

References

#CVE-2018-5159: Integer overflow and out-of-bounds write in Skia

Reporter
Ivan Fratric
Impact
high
Description

An integer overflow can occur in the Skia library due to 32-bit integer use in an array without integer overflow checks, resulting in possible out-of-bounds writes. This could lead to a potentially exploitable crash triggerable by web content.

References

#CVE-2018-5161: Hang via malformed headers

Reporter
cure53
Impact
moderate
Description

Crafted message headers can cause a Thunderbird process to hang on receiving the message.

References

#CVE-2018-5162: Encrypted mail leaks plaintext through src attribute

Reporter
Damian Poddebniak, Christian Dresen, Jens Müller, Fabian Ising, Sebastian Schinzel, Simon Friedberger, Juraj Somorovsky, Jörg Schwenk
Impact
moderate
Description

Plaintext of decrypted emails can leak through the src attribute of remote images, or links.

References

#CVE-2018-5170: Filename spoofing for external attachments

Reporter
cure53
Impact
moderate
Description

It is possible to spoof the filename of an attachment and display an arbitrary attachment name. This could lead to a user opening a remote attachment which is a different file type than expected.

References

#CVE-2018-5168: Lightweight themes can be installed without user interaction

Reporter
Wladimir Palant
Impact
moderate
Description

Sites can bypass security checks on permissions to install lightweight themes by manipulating the baseURI property of the theme element. This could allow a malicious site to install a theme without user interaction which could contain offensive or embarrassing images.

References

#CVE-2018-5174: Windows Defender SmartScreen UI runs with less secure behavior for downloaded files in Windows 10 April 2018 Update

Reporter
Jimmy
Impact
moderate
Description

In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the SEE_MASK_FLAG_NO_UI flag associated with downloaded files and will not show any UI. Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed to be opened because Windows won’t prompt the user to ask what to do. Firefox incorrectly sets this flag when downloading files, leading to less secure behavior from SmartScreen.
Note: this issue only affects Windows 10 users running the April 2018 update or later. It does not affect other Windows users or other operating systems.

References

#CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion through legacy extension

Reporter
Root Object
Impact
moderate
Description

A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur.

References

#CVE-2018-5185: Leaking plaintext through HTML forms

Reporter
Damian Poddebniak, Christian Dresen, Jens Müller, Fabian Ising, Sebastian Schinzel, Simon Friedberger, Juraj Somorovsky, Jörg Schwenk
Impact
low
Description

Plaintext of decrypted emails can leak through by user submitting an embedded form.

References

#CVE-2018-5150: Memory safety bugs fixed in Firefox 60, Firefox ESR 52.8, and Thunderbird 52.8

Reporter
Mozilla developers and community
Impact
critical
Description

Mozilla developers and community members Christoph Diehl, Randell Jesup, Tyson Smith, Alex Gaynor, Ronald Crane, Julian Hector, Kannan Vijayan, and Jason Kratzer reported memory safety bugs present in Firefox 59, Firefox ESR 52.7, and Thunderbird 52.7. 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