Improper validation of integrity check value in firefox-esr (Alpine package)

1) Improper validation of integrity check value

EUVDB-ID: #VU20822

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11753

CWE-ID: CWE-354 - Improper Validation of Integrity Check Value

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the Mozilla Maintenance Service does not check integrity of the binary files that were installed into a custom and unprotected folder on the system. A local user can manipulate the Mozilla Maintenance Service to update this unprotected location and escalate privilege on the system.

Note, the vulnerability affects Windows installation only.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 60.4.0-r0 - 68.11.0-r0

External links

http://git.alpinelinux.org/aports/commit/?id=df118d5706ba2d60b54d1285b0c2544abd2dc984
http://git.alpinelinux.org/aports/commit/?id=ebf9184f5bbef1f9faab710ffb48bb36b5bae10e

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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