CVE-2023-34253
Grav Remote Code Execution Vulnerability
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.
INFO
Published Date :
June 14, 2023, 11:15 p.m.
Last Modified :
Nov. 7, 2023, 4:15 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-34253.
| URL | Resource |
|---|---|
| https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1952-L2190 | Issue Tracking |
| https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b | Patch |
| https://github.com/getgrav/grav/security/advisories/GHSA-j3v8-v77f-fvgm | Exploit Vendor Advisory |
| https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/ | Exploit Third Party Advisory |
| https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83 | Patch |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-34253 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2023-34253 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Changed Description Grav is a file-based Web platform. 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. 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. -
Initial Analysis by [email protected]
Jun. 23, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1952-L2190 No Types Assigned https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L1952-L2190 Issue Tracking Changed Reference Type https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b No Types Assigned https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b Patch Changed Reference Type https://github.com/getgrav/grav/security/advisories/GHSA-j3v8-v77f-fvgm No Types Assigned https://github.com/getgrav/grav/security/advisories/GHSA-j3v8-v77f-fvgm Exploit, Vendor Advisory Changed Reference Type https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/ No Types Assigned https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/ Exploit, Third Party Advisory Changed Reference Type https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83 No Types Assigned https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83 Patch Added CWE NIST CWE-94 Added CPE Configuration OR *cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:* versions up to (excluding) 1.7.42
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-34253 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-34253
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.53 }} 0.15%
score
0.87352
percentile