Information disclosure in alpine (Alpine package)

1) Information disclosure

EUVDB-ID: #VU32981

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-14929

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Alpine before 2.23 silently proceeds to use an insecure connection after a /tls is sent in certain circumstances involving PREAUTH, which is a less secure behavior than the alternative of closing the connection and letting the user decide what they would like to do.

Mitigation

Install update from vendor's website.

Vulnerable software versions

alpine (Alpine package): 2.22-r1 - 2.23-r0

exiv2 (Alpine package): 0.25-r0 - 0.27.2-r2

CPE2.3

• cpe:2.3:a:alpine:alpine_alpine_package:2.22-r1:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:a:alpine:alpine_alpine_package:2.22.1-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:a:alpine:alpine_alpine_package:2.23-r0:*:*:*:*:alpine_linux:*:3.12
• cpe:2.3:a:alpine:exiv2_alpine_package:0.25-r0:*:*:*:*:alpine_linux:*:3.3
• cpe:2.3:a:alpine:exiv2_alpine_package:0.26-r0:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:a:alpine:exiv2_alpine_package:0.26-r1:*:*:*:*:alpine_linux:*:3.8

External links

https://git.alpinelinux.org/aports/commit/?id=66ca4ba2532b695607ae4db891956689cc0700fb
https://git.alpinelinux.org/aports/commit/?id=9aab57a5755359162e713672ac40fcba0ac9f1b2

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.