Improper Authentication in linux-pam (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-27780
CWE-ID CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
 linux-pam (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) Improper Authentication

EUVDB-ID: #VU48796

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-27780

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests in Linux PAM module. A remote or local attacker can bypass authentication process and gain unauthorized access to the application.

Successful exploitation of the vulnerability requires that the account used for authentication does not exists on the system and the password for root account is empty (but root locked down).

Mitigation

Install update from vendor's website.

Vulnerable software versions

linux-pam (Alpine package): 1.4.0-r1

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=c688a0f0cc909614ef7b18ceafbad81de10782a1


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.



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