CVE-2020-13443
ExpressionEngine before 5.3.2 allows remote attackers to upload and execute arbitrary code in a .php%20 file via Compose Msg, Add attachment, and Save As Draft actions.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
ExpressionEngine before 5.3.2 allows remote attackers to upload and execute arbitrary code in a .php%20 file via Compose Msg, Add attachment, and Save As Draft actions. A user with low privileges (member) is able to upload this. It is possible to bypass the MIME type check and file-extension check while uploading new files. Short aliases are not used for an attachment; instead, direct access is allowed to the uploaded files. It is possible to upload PHP only if one has member access, or registration/forum is enabled and one can create a member with the default group id of 5. To exploit this, one must to be able to send and compose messages (at least).
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.13% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-434
- Affected
- expressionengine/expressionengine
- Source
- cve@mitre.org
References
- https://expressionengine.com/blogVendor Advisory
- https://gist.github.com/mariuszpoplwski/51604d8a6d7d78fffdf590c25e844e09Exploit, Third Party Advisory
- https://expressionengine.com/blogVendor Advisory
- https://gist.github.com/mariuszpoplwski/51604d8a6d7d78fffdf590c25e844e09Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.