CVE-2009-4137
The loadContentFromCookie function in core/Cookie.php in Piwik before 0.5 does not validate strings obtained from cookies before calling the unserialize function, which allows remote attackers to execute arbitrary code or upload arbitrary files via…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 16.9%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
The loadContentFromCookie function in core/Cookie.php in Piwik before 0.5 does not validate strings obtained from cookies before calling the unserialize function, which allows remote attackers to execute arbitrary code or upload arbitrary files via vectors related to the __destruct function in the Piwik_Config class; php://filter URIs; the __destruct functions in Zend Framework, as demonstrated by the Zend_Log destructor; the shutdown functions in Zend Framework, as demonstrated by the Zend_Log_Writer_Mail class; the render function in the Piwik_View class; Smarty templates; and the _eval function in Smarty.
- CVSS 2.0
- 7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
- EPSS
- 16.95% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- matomo/matomo
- Source
- secalert@redhat.com
EPSS 16.9% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://dev.piwik.org/trac/changeset/1637Vendor Advisory
- http://piwik.org/blog/2009/12/piwik-response-to-shocking-news-in-php-exploitation/Vendor Advisory
- http://www.openwall.com/lists/oss-security/2009/12/09/2
- http://www.openwall.com/lists/oss-security/2009/12/10/1
- http://www.openwall.com/lists/oss-security/2009/12/14/2
- http://www.sektioneins.de/en/advisories/advisory-032009-piwik-cookie-unserialize-vulnerability/
- http://www.suspekt.org/2009/12/09/advisory-032009-piwik-cookie-unserialize-vulnerability/
- http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
- http://dev.piwik.org/trac/changeset/1637Vendor Advisory
- http://piwik.org/blog/2009/12/piwik-response-to-shocking-news-in-php-exploitation/Vendor Advisory
- http://www.openwall.com/lists/oss-security/2009/12/09/2
- http://www.openwall.com/lists/oss-security/2009/12/10/1
- http://www.openwall.com/lists/oss-security/2009/12/14/2
- http://www.sektioneins.de/en/advisories/advisory-032009-piwik-cookie-unserialize-vulnerability/
- http://www.suspekt.org/2009/12/09/advisory-032009-piwik-cookie-unserialize-vulnerability/
- http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.