Ubuntu update for python3.8

1) Infinite loop

EUVDB-ID: #VU59089

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

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 3.9.5-3ubuntu0~21.04.1

libpython3.9-stdlib (Ubuntu package): before 3.9.5-3ubuntu0~21.04.1

python3.9-minimal (Ubuntu package): before 3.9.5-3ubuntu0~21.04.1

External links

http://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.