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CVE-2018-1285: Apache Log4net: XML external entity injection

CVE-2018-1285 is rated critical with a CVSS v3.1 base score of 9.8 and affects Apache Log4net, along with 6 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-611: Improper Restriction of XML External Entity Reference

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected products

  • Apache Log4net: before 2.0.10
  • Fedoraproject: 30; 31; 32
  • Oracle Application Testing Suite: 13.3.0.1
  • Oracle Hospitality Opera 5: 5.5; 5.6
  • Oracle Hospitality Simphony: 18.2.7.2; 19.1.3
  • Netapp Manageability Software Development Kit: all versions listed by NVD
  • Netapp Snapcenter: all versions listed by NVD

References