Remote code execution in Mozilla Firefox and Firefox ESR

Published: 2019-06-18 19:44:57 | Updated: 2019-06-20
Severity Critical
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-11707
CVSSv3 8.4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]
CWE ID CWE-843
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Firefox ESR
Mozilla Firefox
Vulnerable software versions Firefox ESR 60.7.0
Firefox ESR 60.6.3
Firefox ESR 60.6.2

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Mozilla Firefox 67.0.2
Mozilla Firefox 67.0.1
Mozilla Firefox 67.0

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Vendor URL Mozilla

Security Advisory

UPDATED 20.06.2019
Added information about additional vulnerability, exploited in the attack.

1) Type Confusion

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error when manipulating JavaScript objects due to issues in Array.pop. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being actively exploited in the wild along with SB2019062002 (CVE-2019-11708).

Remediation

Install updates from vendor's website.

External links

https://www.mozilla.org/en-US/security/advisories/mfsa2019-18/
https://twitter.com/5aelo/status/1141273394723414016
https://twitter.com/SecurityGuyPhil/status/1141466335592869888

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