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CVE details

CVE-2022-45061

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.

Score
7.5 high
Published
2022-11-09
Links
NVD · cve.org

Affected ports (1)

PortPackageVersionStatusMaintainer
lang/python27python272.7.18_5unaddressedpython@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>python27</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2022-45061</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2022-45061</url>
    </references>
    <dates>
      <discovery>2022-11-09</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>