GHSA-vvwv-h69m-wg6f

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    GHSA-vvwv-h69m-wg6f

    Published: 20 Nov 2019Last Modified: 6 Mar 2025

    Summary: XXE in PHPSpreadsheet due to incomplete fix for previous encoding issue

    Details: PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue. The XmlScanner decodes the sheet1.xml from an .xlsx to utf-8 if something else than UTF-8 is declared in the header. This was a security measurement to prevent CVE-2018-19277 but the fix is not sufficient. By double-encoding the the xml payload to utf-7 it is possible to bypass the check for the string ?<!ENTITY? and thus allowing for an xml external entity processing (XXE) attack.

    References: https://nvd.nist.gov/vuln/detail/CVE-2019-12331, https://github.com/PHPOffice/PhpSpreadsheet/pull/1041, https://github.com/PHPOffice/PhpSpreadsheet/commit/0e6238c69e863b58aeece61e48ea032696c6dccd, https://github.com/FriendsOfPHP/security-advisories/blob/master/phpoffice/phpspreadsheet/CVE-2019-12331.yaml, https://github.com/PHPOffice/PhpSpreadsheet, https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01, https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.8.0, https://herolab.usd.de/security-advisories/usd-2019-0046

    Affected packages

    Package

    Name: phpoffice/phpspreadsheet

    Purl: pkg:composer/phpoffice/phpspreadsheet

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.8.0

    Affected versions

    1.0.0
    1.0.0-beta
    1.0.0-beta2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-vvwv-h69m-wg6f | CVE-DB