Improper Authentication in libvirt (Alpine package)

1) Improper Authentication

EUVDB-ID: #VU33986

Risk: Medium

CVSSv4.0: 4.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-5008

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 in when processing authentication requests. libvirt before 2.0.0 improperly disables password checking when the password on a VNC server is set to an empty string, which allows remote attackers to bypass authentication and establish a VNC session by connecting to the server.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libvirt (Alpine package): 1.1.4-r0 - 1.2.11-r0

CPE2.3

• cpe:2.3:o:alpine:libvirt_alpine_package:1.1.4-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:libvirt_alpine_package:1.1.4-r1:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:libvirt_alpine_package:1.1.4-r2:*:*:*:*:alpine_linux:*:2.6

External links

https://git.alpinelinux.org/aports/commit/?id=0b2c0b7464ec1f08d031a6736dfd33bcb4dba7a1
https://git.alpinelinux.org/aports/commit/?id=30dd31aad0b6aab5f2a186648375ed55de573b9f
https://git.alpinelinux.org/aports/commit/?id=fe21e87ffd9382eed66543f8c2d0f740878849d7
https://git.alpinelinux.org/aports/commit/?id=0506722e21955765f56dfc4b6f2af39ad6b1a338

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.