This security advisory describes one medium risk vulnerability.

1) Infinite loop

Risk: Medium

CVSSv3:
6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2019-20907

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 In Lib/tarfile.py in Python. A remote attacker can create a specially crafted TAR archive leading to an infinite loop when opened by tarfile.open, because _proc_pax lacks header validation.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

python (Red Hat package):
2.7.5-34.el7, 2.7.5-38.el7_2, 2.7.5-48.el7, 2.7.5-58.el7, 2.7.5-59.el7_4, 2.7.5-63.el7_4, 2.7.5-69.el7_5, 2.7.5-70.el7_5, 2.7.5-74.el7_5, 2.7.5-76.el7, 2.7.5-77.el7_6, 2.7.5-80.el7_6, 2.7.5-83.el7_6, 2.7.5-86.el7, 2.7.5-87.el7_7, 2.7.5-88.el7, 2.7.5-89.el7

Red Hat Enterprise Linux for Power, little endian:
7

Red Hat Enterprise Linux for Power, big endian:
7

Red Hat Enterprise Linux for IBM z Systems:
7

Red Hat Enterprise Linux for Scientific Computing:
7

Red Hat Enterprise Linux Desktop:
7

Red Hat Enterprise Linux Workstation:
7

Red Hat Enterprise Linux Server:
7

CPE

External links

https://access.redhat.com/errata/RHSA-2020:5009

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.



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