Improperly implemented security check for standard in firefox-esr (Alpine package)
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-23969 |
| CWE-ID | CWE-358 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
firefox-esr (Alpine package) Operating systems & Components / Operating system package or component |
| Vendor | Alpine Linux Development Team |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Improperly implemented security check for standard
EUVDB-ID: #VU50879
Risk: Medium
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-23969
CWE-ID:
CWE-358 - Improperly Implemented Security Check for Standard
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect implementation of W3C Content Security Policy. Under certain types of redirects Firefox incorrectly sets the source
file to be the destination of the redirects. A remote attacker can gain knowledge of the destination URL.
Install update from vendor's website.
Vulnerable software versionsfirefox-esr (Alpine package): 60.4.0-r0 - 78.7.1-r0
External linkshttp://git.alpinelinux.org/aports/commit/?id=3602287df783771e39fffd4c836b0147d075f952
http://git.alpinelinux.org/aports/commit/?id=a1d19abf21c73ef32e77680d139e05cf9f37095d
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.
