CVE-2024-52596 – simplesamlphp/xml-common

Package

Manager: composer
Name: simplesamlphp/xml-common
Vulnerable Version: >=0 <1.20.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:L/SI:L/SA:N

EPSS: 0.00074 pctl0.22913

Details

SimpleSAMLphp xml-common XXE vulnerability Summary When loading an (untrusted) XML document, for example the SAMLResponse, it's possible to induce an XXE. $options is defined as: https://github.com/simplesamlphp/xml-common/blob/v1.19.0/src/DOMDocumentFactory.php#L39 including the DTDLoad option, which allows an attacker to read file contents from local file system OR internal network. While there is the NONET option, an attacker can simply bypass if by using PHP filters: php://filter/convert.base64-encode/resource=http://URL OR FILE From there an attacker can induce network connections and steal the targeted file OOB (haven't fully tested this). RCE may be possible with the php://expect or php://phar wrappers, but this hasn't been tested. Note: The mitigation here: https://github.com/simplesamlphp/xml-common/blob/v1.19.0/src/DOMDocumentFactory.php#L58 Comes too late, as the XML has already been loaded into a document. Mitigation: Remove the LIBXML_DTDLOAD | LIBXML_DTDATTR options. Additionally, as a defense in depth measure, check if there is the string: <!DOCTYPE inside the XML before parsing it. (This is not a complete fix because someone may be able to exploit some parser differentials, to load a DOCTYPE, maybe through spacing like: <! DOCTYPE)

Metadata

Created: 2024-12-02T17:14:30Z
Modified: 2024-12-12T22:19:57Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-2x65-fpch-2fcm/GHSA-2x65-fpch-2fcm.json
CWE IDs: ["CWE-611"]
Alternative ID: GHSA-2x65-fpch-2fcm
Finding: F083
Auto approve: 1