Use-after-free in firefox-esr (Alpine package)

1) Use-after-free

EUVDB-ID: #VU18035

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-9796

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the SMIL animation controller. A remote attacker can trick the victim to visit a specially crafted web page, trigger use-after-free error and execute arbitrary code on the system with privileges of the current user.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 60.4.0-r0 - 60.5.2-r0

CPE2.3

• cpe:2.3:a:alpine:firefox-esr_alpine_package:60.4.0-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:firefox-esr_alpine_package:60.4.0-r1:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:firefox-esr_alpine_package:60.5.0-r0:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=5f4478599688e562154c7fc319b29c46f79083bf
https://git.alpinelinux.org/aports/commit/?id=985780d336a595bbba269e8d1c32715d70dbee68

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.