LSV-636: 'portlet.resource.id.banned.paths.regexp' bypass with doubled encoded URLs

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.2 EE GA1 (6.2.10), 7.0 DE (7.0.10), 7.1 DXP (7.1.10), 7.2 DXP (7.2.10)
• Fix Version/s: 6.2.X EE, 7.0.X EE, 7.1.x EE, 7.2.X EE
• Component/s: Core Infrastructure, Security Vulnerability
• Labels:
  • liferay-fixpack-de-93-7010
  • liferay-fixpack-dxp-19-7110
  • liferay-fixpack-dxp-7-7210
  • liferay-fixpack-portal-173-6210
  • lsv
  • lsv-636
  • sev-2
• Fix Pack Status: Scheduled
• Business Value: 4
• CVE IDs: CVE-2020-15840
• CVSS Base Score: 5.3
• CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• 7.0 Fix Pack Version: 93
• 7.1 Fix Pack Version: 19
• 7.2 Fix Pack Version: 7

In Liferay Portal 6.2 EE and in Liferay DXP 7.2, DXP 7.1 and DXP 7.0, the property 'portlet.resource.id.banned.paths.regexp' can be bypassed with doubled encoded URLs.

See also https://help.liferay.com/hc/en-us/articles/360046138052.