[arch-security] [ASA-201504-4] firefox: certificate verification bypass

[Remi Gacogne]

Arch Linux Security Advisory ASA-201504-4
=========================================

Severity: Critical
Date    : 2015-04-04
CVE-ID  : CVE-2015-0799
Package : firefox
Type    : certificate verification bypass
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package firefox before version 37.0.1-1 is vulnerable to certificate
verification bypass.

Resolution
==========

Upgrade to 37.0.1-1.

# pacman -Syu "firefox>=37.0.1-1"

The problem has been fixed upstream in version 37.0.1.

Workaround
==========

None.

Description
===========

Security researcher Muneaki Nishimura discovered a flaw in the Mozilla's
HTTP Alternative Services implementation. If an Alt-Svc header is
specified in the HTTP/2 response, SSL certificate verification can be
bypassed for the specified alternate server. As a result of this,
warnings of invalid SSL certificates will not be displayed and an
attacker could potentially impersonate another site through a
man-in-the-middle (MTIM), replacing the original certificate with their own.

Impact
======

A remote attacker in position of man-in-the-middle can impersonate
another site, bypassing certificate validation.

References
==========

https://www.mozilla.org/en-US/security/advisories/mfsa2015-44/
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-0799

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