SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2022-45061

An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service.

HIGH 7.5EPSS 2.65%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (2.65%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.

CVSS 3.1
7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
2.65% probability · 85th percentile
CISA KEV
Not listed
Weakness
CWE-407
Affected
python/python · fedoraproject/fedora · netapp/active iq unified manager · netapp/e-series performance analyzer · netapp/element software · netapp/hci · netapp/management services for element software · netapp/ontap select deploy administration utility · netapp/bootstrap os
Source
cve@mitre.org

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.