Algorithm Downgrade in firefox (Alpine package)

1) Algorithm Downgrade

EUVDB-ID: #VU24061

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-17023

CWE-ID: CWE-757 - Selection of Less-Secure Algorithm During Negotiat

Exploit availability: No

Description

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

The vulnerability exists due to insecure negotiation After a HelloRetryRequest in Mozilla NSS that can lead to selection of a less secure protocol (e.g. TLS 1.2 or below) after the HelloRetryRequest TLS 1.3 is sent.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox (Alpine package): 68.0.2-r0 - 71.0-r1

CPE2.3

• 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
• cpe:2.3:a:alpine:firefox_alpine_package:70.0-r0:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=d0f548c93f300779d1813359b060cf641865b16c
https://git.alpinelinux.org/aports/commit/?id=af0d1d1edd77beb85efb9bbf0ad15000eb319170
https://git.alpinelinux.org/aports/commit/?id=6bd97a798e3c51b56b55118b7af19a70462db325

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.