Origin validation error in firefox (Alpine package)

1) Origin validation error

EUVDB-ID: #VU48460

Risk: Medium

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-16012

CWE-ID: CWE-346 - Origin Validation Error

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to the way browser handles requests to cross-origin images. When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage function takes a variable amount of time depending on the content of the underlying image. This results in cross-origin information exposure of image content through timing side-channel attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox (Alpine package): 77.0-r0 - 79.0-r1

CPE2.3

• cpe:2.3:a:alpine:firefox_alpine_package:77.0-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:a:alpine:firefox_alpine_package:77.0.1-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:a:alpine:firefox_alpine_package:77.0.1-r1:*:*:*:*:alpine_linux:*:3.12

External links

https://git.alpinelinux.org/aports/commit/?id=13a8f0d1284680f721e935cc6d3cb2649cf25093

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.