Information disclosure in dropbear (Alpine package)

1) Information disclosure

EUVDB-ID: #VU14821

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-9079

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the application allows usage of symlinks when configured with authorized_keys file format and a command= option. A local user can read certain files on the system with root privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

dropbear (Alpine package): 2012.55-r0 - 2016.74-r0

CPE2.3

• cpe:2.3:o:alpine:dropbear_alpine_package:2012.55-r0:*:*:*:*:alpine_linux:*:2.4
• cpe:2.3:o:alpine:dropbear_alpine_package:2013.58-r0:*:*:*:*:alpine_linux:*:2.6
• cpe:2.3:o:alpine:dropbear_alpine_package:2014.66-r0:*:*:*:*:alpine_linux:*:3.1

External links

https://git.alpinelinux.org/aports/commit/?id=ea5e2a6272e38458c8d64e5cb59cfc089a5c9a93
https://git.alpinelinux.org/aports/commit/?id=9ee60284bf43844b66bb000070cc8cff672140a1
https://git.alpinelinux.org/aports/commit/?id=b204c902de27dc4e5e9efddb3dd9af012c70e268
https://git.alpinelinux.org/aports/commit/?id=b798fc52c6aa85782652617ee817f26a9412f861

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.