CVE - CVE-2023-34253

CVE-ID
CVE-2023-34253	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
Grav is a flat-file content management system. Prior to version 1.7.42, the denylist introduced in commit 9d6a2d to prevent dangerous functions from being executed via injection of malicious templates was insufficient and could be easily subverted in multiple ways -- (1) using unsafe functions that are not banned, (2) using capitalised callable names, and (3) using fully-qualified names for referencing callables. Consequently, a low privileged attacker with login access to Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain remote code execution. A patch in version 1.7.42 improves the denylist.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1952-L2190 URL:https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1952-L2190 MISC:https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b URL:https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b MISC:https://github.com/getgrav/grav/security/advisories/GHSA-j3v8-v77f-fvgm URL:https://github.com/getgrav/grav/security/advisories/GHSA-j3v8-v77f-fvgm MISC:https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/ URL:https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/ MISC:https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83 URL:https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20230531	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20230531)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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