Ubuntu update for python2.7

1) CRLF injection

EUVDB-ID: #VU48592

Risk: Medium

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

CVE-ID: CVE-2020-26116

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to inject arbitrary data in server response.

The vulnerability exists due to insufficient validation of attacker-supplied data in "http.client". A remote attacker can pass specially crafted data to the application containing CR-LF characters and modify application behavior.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 12.04 - 18.04

python3.4-minimal (Ubuntu package): before 3.4.3-1ubuntu1~14.04.7+esm8

python3.4 (Ubuntu package): before 3.4.3-1ubuntu1~14.04.7+esm8

python2.7-minimal (Ubuntu package): before 2.7.3-0ubuntu3.19

python2.7 (Ubuntu package): before 2.7.3-0ubuntu3.19

python3.6-minimal (Ubuntu package): before 3.6.9-1~18.04ubuntu1.3

python3.6 (Ubuntu package): before 3.6.9-1~18.04ubuntu1.3

python3.5-minimal (Ubuntu package): before 3.5.2-2ubuntu0~16.04.12

python3.5 (Ubuntu package): before 3.5.2-2ubuntu0~16.04.12

CPE2.3

• cpe:2.3:o:canonical:ubuntu:12.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:14.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:python3.4-minimal:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python34_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python2.7-minimal_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python27_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python3.6-minimal_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python36_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python3.5-minimal_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:python35_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4581-1

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.