CVE-2023-27577

flarum is a forum software package for building communities. In versions prior to 1.7.0 an admin account which has already been compromised by an attacker may use a vulnerability in the `LESS` parser which can be exploited to read sensitive files on the server through the use of path traversal techniques. An attacker can achieve this by providing an absolute path to a sensitive file in the custom `LESS` setting, which the `LESS` parser will then read. For example, an attacker could use the following code to read the contents of the `/etc/passwd` file on a linux machine. The scope of what files are vulnerable will depend on the permissions given to the running flarum process. The vulnerability has been addressed in version `1.7`. Users should upgrade to this version to mitigate the vulnerability. Users unable to upgrade may mitigate the vulnerability by ensuring that their admin accounts are secured with strong passwords and follow other best practices for account security. Additionally, users can limit the exposure of sensitive files on the server by implementing appropriate file permissions and access controls at the operating system level.

CVSS v3 4.9 MEDIUM

4.9^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/flarum/framework/commit/1761660c98ea5a3e9665fb8e6041d1f2ee62a444	Patch
https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:*

History

07 Nov 2023, 04:10

Type	Values Removed	Values Added
Summary	flarum is a forum software package for building communities. In versions prior to 1.7.0 an admin account which has already been compromised by an attacker may use a vulnerability in the `LESS` parser which can be exploited to read sensitive files on the server through the use of path traversal techniques. An attacker can achieve this by providing an absolute path to a sensitive file in the custom `LESS` setting, which the `LESS` parser will then read. For example, an attacker could use the following code to read the contents of the `/etc/passwd` file on a linux machine. The scope of what files are vulnerable will depend on the permissions given to the running flarum process. The vulnerability has been addressed in version `1.7`. Users should upgrade to this version to mitigate the vulnerability. Users unable to upgrade may mitigate the vulnerability by ensuring that their admin accounts are secured with strong passwords and follow other best practices for account security. Additionally, users can limit the exposure of sensitive files on the server by implementing appropriate file permissions and access controls at the operating system level.	flarum is a forum software package for building communities. In versions prior to 1.7.0 an admin account which has already been compromised by an attacker may use a vulnerability in the `LESS` parser which can be exploited to read sensitive files on the server through the use of path traversal techniques. An attacker can achieve this by providing an absolute path to a sensitive file in the custom `LESS` setting, which the `LESS` parser will then read. For example, an attacker could use the following code to read the contents of the `/etc/passwd` file on a linux machine. The scope of what files are vulnerable will depend on the permissions given to the running flarum process. The vulnerability has been addressed in version `1.7`. Users should upgrade to this version to mitigate the vulnerability. Users unable to upgrade may mitigate the vulnerability by ensuring that their admin accounts are secured with strong passwords and follow other best practices for account security. Additionally, users can limit the exposure of sensitive files on the server by implementing appropriate file permissions and access controls at the operating system level.

16 Mar 2023, 15:35

Type	Values Removed	Values Added
CPE		cpe:2.3:a:flarum:flarum::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 4.9
First Time		Flarum Flarum flarum
References	~~(MISC) https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw -~~	(MISC) https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw - Vendor Advisory
References	~~(MISC) https://github.com/flarum/framework/commit/1761660c98ea5a3e9665fb8e6041d1f2ee62a444 -~~	(MISC) https://github.com/flarum/framework/commit/1761660c98ea5a3e9665fb8e6041d1f2ee62a444 - Patch

10 Mar 2023, 21:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2023-03-10 21:15

Updated : 2023-12-10 14:48

NVD link : CVE-2023-27577

Mitre link : CVE-2023-27577

CVE.ORG link : CVE-2023-27577

JSON object : View

Products Affected

flarum

flarum

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

4.9 /10