Information disclosure in curl (Alpine package)

1) Information disclosure

EUVDB-ID: #VU48893

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8284

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the way cURL handles PASV responses. A remote attacker with control over malicious FTP server can use the PASV response to trick curl into connecting back to a given IP address and port, and this way potentially make curl extract information about services that are otherwise private and not disclosed, for example doing port scanning and service banner extractions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

curl (Alpine package): 7.19.6-r0 - 7.73.0-r0

curl (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:curl_alpine_package:7.69.1-r3:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:curl_alpine_package:7.67.0-r3:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:curl_alpine_package:7.66.0-r3:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:curl_alpine_package::*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=a2da5d177a121c47684eb9ee6e49351cdaeae06b

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.