Kirby is a content management system. A vulnerability in versions prior to 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6 only affects Kirby sites that use the `Xml` data handler (e.g. `Data::decode($string, 'xml')`) or the `Xml::parse()` method in site or plugin code. The Kirby core does not use any of the affected methods. XML External Entities (XXE) is a little used feature in the XML markup language that allows to include data from external files in an XML structure. If the name of the external file can be controlled by an attacker, this becomes a vulnerability that can be abused for various system impacts like the disclosure of internal or confidential data that is stored on the server (arbitrary file disclosure) or to perform network requests on behalf of the server (server-side request forgery, SSRF). Kirby's `Xml::parse()` method used PHP's `LIBXML_NOENT` constant, which enabled the processing of XML external entities during the parsing operation. The `Xml::parse()` method is used in the `Xml` data handler (e.g. `Data::decode($string, 'xml')`). Both the vulnerable method and the data handler are not used in the Kirby core. However they may be used in site or plugin code, e.g. to parse RSS feeds or other XML files. If those files are of an external origin (e.g. uploaded by a user or retrieved from an external URL), attackers may be able to include an external entity in the XML file that will then be processed in the parsing process. Kirby sites that don't use XML parsing in site or plugin code are *not* affected. The problem has been patched in Kirby 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6. In all of the mentioned releases, the maintainers have removed the `LIBXML_NOENT` constant as processing of external entities is out of scope of the parsing logic. This protects all uses of the method against the described vulnerability.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Kirby is a content management system. A vulnerability in versions prior to 3.5.8.3, 3.6.6.3, 3.7.5.2,
    3.8.4.1, and 3.9.6 only affects Kirby sites that use the `Xml` data handler (e.g. `Data::decode($string,
    'xml')`) or the `Xml::parse()` method in site or plugin code. The Kirby core does not use any of the
    affected methods. XML External Entities (XXE) is a little used feature in the XML markup language that
    allows to include data from external files in an XML structure. If the name of the external file can be
    controlled by an attacker, this becomes a vulnerability that can be abused for various system impacts like
    the disclosure of internal or confidential data that is stored on the server (arbitrary file disclosure)
    or to perform network requests on behalf of the server (server-side request forgery, SSRF). Kirby's
    `Xml::parse()` method used PHP's `LIBXML_NOENT` constant, which enabled the processing of XML external
    entities during the parsing operation. The `Xml::parse()` method is used in the `Xml` data handler (e.g.
    `Data::decode($string, 'xml')`). Both the vulnerable method and the data handler are not used in the Kirby
    core. However they may be used in site or plugin code, e.g. to parse RSS feeds or other XML files. If
    those files are of an external origin (e.g. uploaded by a user or retrieved from an external URL),
    attackers may be able to include an external entity in the XML file that will then be processed in the
    parsing process. Kirby sites that don't use XML parsing in site or plugin code are *not* affected. The
    problem has been patched in Kirby 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6. In all of the mentioned
    releases, the maintainers have removed the `LIBXML_NOENT` constant as processing of external entities is
    out of scope of the parsing logic. This protects all uses of the method against the described
    vulnerability. (CVE-2023-38490)

ID	Name	Product	Family	Severity
417825	SCA: security update for getkirby/cms (GHSA-q386-w6fg-gmgp)	Tenable Cloud Security	SCA Checks	critical
417825	SCA: security update for getkirby/cms (GHSA-q386-w6fg-gmgp)	Tenable Self-Hosted Container Security	SCA Checks	critical

Detections

Analytics

CVE-2023-38490

critical

Tenable Plugins

critical

critical