#VU33034 Use-after-free in Firefox ESR - CVE-2019-11713

Vulnerability identifier: #VU33034

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-11713

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox ESR
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

A use-after-free vulnerability can occur in HTTP/2 when a cached HTTP/2 stream is closed while still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Firefox ESR: 60.0 - 60.7.2

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.html
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.html
https://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.html
https://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
https://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1528481
https://lists.debian.org/debian-lts-announce/2019/08/msg00001.html
https://lists.debian.org/debian-lts-announce/2019/08/msg00002.html
https://security.gentoo.org/glsa/201908-12
https://security.gentoo.org/glsa/201908-20
https://www.mozilla.org/security/advisories/mfsa2019-21/
https://www.mozilla.org/security/advisories/mfsa2019-22/
https://www.mozilla.org/security/advisories/mfsa2019-23/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.