Ubuntu update for python3.8

1) Infinite loop

EUVDB-ID: #VU59089

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3737

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop. A remote attacker who controls a malicious server can force the client to enter an infinite loop on a 100 Continue response.

Mitigation

Update the affected package python3.8 to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 21.04

python3.8-minimal (Ubuntu package): before 3.8.10-0ubuntu1~20.04.2

python3.8 (Ubuntu package): before 3.8.10-0ubuntu1~20.04.2

libpython3.8-stdlib (Ubuntu package): before 3.8.10-0ubuntu1~20.04.2

python3.9 (Ubuntu package): before 3.9.5-3ubuntu0~20.04.1

libpython3.9-stdlib (Ubuntu package): before 3.9.5-3ubuntu0~20.04.1

python3.9-minimal (Ubuntu package): before 3.9.5-3ubuntu0~20.04.1

CPE2.3

• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:21.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:python3.8-minimal_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:python3.8_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:libpython3.8-stdlib_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:python3.9_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:libpython3.9-stdlib_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:python3.9-minimal_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-5201-1

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.