Out-of-bounds write in firefox (Alpine package)

1) Out-of-bounds write

EUVDB-ID: #VU26650

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-2020-6822

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in GMPDecodeData when processing images larger than 4Gb on 32-bit builds. A remote attacker can create a specially crafted image, trick the victim into opening it, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox (Alpine package): 60.0.1-r0 - 74.0.1-r0

CPE2.3

• cpe:2.3:a:alpine:firefox_alpine_package:60.0.1-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:firefox_alpine_package:68.0.2-r0:*:*:*:*:alpine_linux:*:3.10
• cpe:2.3:a:alpine:firefox_alpine_package:69.0.3-r0:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=174183ffc582462ae8eaf468da032a6642e140c4
https://git.alpinelinux.org/aports/commit/?id=9e2f5a5133c02cac8537d753874de3c9ba0ad559
https://git.alpinelinux.org/aports/commit/?id=cd10d6d99b0bd648c2c7d300f927db55bbc1cf03
https://git.alpinelinux.org/aports/commit/?id=e59828690fd9f113c4135307defdd4de09b962ad
https://git.alpinelinux.org/aports/commit/?id=3f24b0ed71ac2a532796e4f065c755d1e92a6858

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.