CIS CYBER SECURITY ADVISORIES
MS-ISAC CYBER SECURITY ADVISORY NUMBER:
Multiple Vulnerabilities in Mozilla Firefox and Thunderbird Could Allow for Remote Code Execution
Multiple vulnerabilities have been identified in Mozilla Firefox and Thunderbird that could allow for remote code execution. Mozilla Firefox is a web browser used to access the Internet and Mozilla Thunderbird is an email client. Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user, or gaining session authentication credentials. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.
There are currently no reports of these vulnerabilities being exploited in the wild.
- Mozilla Firefox
- Mozilla Firefox Extended Support Release (ESR)
- Mozilla Thunderbird
- Large and medium government entities:High
- Small government entities:High
- Large and medium business entities:High
- Small business entities:High
Home users: High
Nine vulnerabilities have been reported in Mozilla Firefox and Thunderbird. Details of the vulnerabilities are as follows:
- A same-origin policy bypass issue when accessing cross-origin objects via the Alarms API. [CVE-2014-1583, MFSA 2014-82]
- A privacy issue where with inconsistent video sharing in iframes. [CVE-2014-1585, CVE-2014-1586, MFSA 2014-81]
- A security bypass issue that allows the bypass of key pinning. [CVE-2014-1584, CVE-2014-1582, MFSA 2014-80]
- A use after free vulnerability during text layout when interacting with text direction [CVE-2014-1581, MFSA 2014-79]
- An uninitialized memory issue when a malformed GIF image is repeatedly rendered within a canvas element [CVE-2014-1580, MFSA 2014-78]
- An out-of-bounds write issue when buffering WebM format video containing frames with invalid tile sizes. [CVE-2014-1578, MFSA 2014-77]
- An out-of-bounds read issue with Web Audio when interacting with custom waveforms with invalid values. [CVE-2014-1577, MFSA 2014-76]
- A buffer overflow vulnerability when making capitalization style changes during CSS parsing. [CVE-2014-1576, MFSA 2014-75]
- Several memory safety bugs in in the browser engine used in Firefox and other Mozilla-based products. [CVE-2014-1574, CVE-2014-1575 MFSA 2014-74]
Successful exploitation of these vulnerabilities could result in an attacker gaining the same privileges as the logged on user, or gaining session authentication credentials. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.
We recommend the following actions be taken:
- Apply appropriate patches provided by Mozilla to vulnerable systems immediately after appropriate testing.
- Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
- Remind users not to click links from unknown sources, or to click links without verifying the intended destination.