Use-after-free in Mozilla Firefox ESR

1) Use-after-free

EUVDB-ID: #VU33034

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 - Use After Free

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:mozilla:firefox_esr:60.7.2:*:*:*:*:*:*:*

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/

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

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