Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / packagist/silverstripe/cms/CVE-2020-9309
Advisory ID gitlab/packagist/silverstripe/cms/CVE-2020-9309
Aliases CVE-2020-9309
GHSA-h77w-655f-6j3m
Summary Unrestricted Upload of File with Dangerous Type Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload contents under allowed file extensions (for example HTML code in a TXT file). When these files are stored as protected or draft files, the MIME detection can cause browsers to execute the file contents. Uploads stored as protected or draft files are allowed by default for authorised users only, but can also be enabled through custom logic as well as modules such as silverstripe/userforms. Sites using the previously optional silverstripe/mimevalidator module can configure MIME allow lists rather than extension allow lists, and hence prevent this issue. Sites on the Common Web Platform (CWP) use this module by default, and are not affected.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (4)
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-434 Unrestricted Upload of File with Dangerous Type
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/cms/CVE-2020-9309.yml
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/cms/CVE-2020-9309.yml
Reference id Reference type URL
CVE-2020-9309 https://nvd.nist.gov/vuln/detail/CVE-2020-9309
CVE-2020-9309 https://www.silverstripe.org/download/security-releases/CVE-2020-9309
GHSA-h77w-655f-6j3m https://github.com/advisories/GHSA-h77w-655f-6j3m
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/cms/CVE-2020-9309.yml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/cms/CVE-2020-9309.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.