Very Low
CVE-2020-14933
CVE ID
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CVE-2020-14933
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
compose.php in SquirrelMail 1.4.22 calls unserialize for the $attachments value, which originates from an HTTP POST request. NOTE: the vendor disputes this because these two conditions for PHP object injection are not satisfied: existence of a PHP magic method (such as __wakeup or __destruct), and any attack-relevant classes must be declared before unserialize is called (or must be autoloaded).
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Ratings
-
Attacker ValueVery Low
-
ExploitabilityVery Low
Technical Analysis
tldr
The use of unserialize in PHP that accepts user data. There is no sequence of code that can be exploited to gain code execution using this method.
Outline
Passing user-controlled data to unserialize in PHP is always a bad idea. However, in order to be exploitable there needs to be additional code that will process the data through the use of Magic Methods. There do not appear to be any dangerous methods that take this data in the current version of the PHP script.
If the base PHP version that is running this application also happens to be a version of PHP vulnerable to https://www.cvedetails.com/cve/CVE-2017-5340/ Then there is an increased possibility of gaining code execution using this methodology.
Patch
At the time of release, there is no official patch although third party patches have been made available here
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General Information
Vendors
- squirrelmail
Products
- squirrelmail 1.4.22
References
Miscellaneous
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Exploited in the Wild
CVE ID
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