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    CVE-2019-12331

    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.

    Published:Nov 7, 2019
    Last Modified:Nov 21, 2024
    EPS:Nov 7, 2019
    EPSS Score:0.00324
    CVSS Score:8.8

    Affected Products

    Vendor
    Phpoffice
    Product
    Phpspreadsheet

    Exploits

    https://herolab.usd.de/security-advisories/usd-2019-0046/https://herolab.usd.de/security-advisories/usd-2019-0046/

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-221 Data Serialization External Entities Blowup

    Related CVEs

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    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