MyBB up to 1.8.25 Theme XML File sql injection

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in MyBB up to 1.8.25. This vulnerability affects unknown code of the component Theme XML File Handler. The manipulation results in sql injection. This vulnerability is identified as CVE-2021-27890. The attack can be executed remotely. Additionally, an exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in MyBB up to 1.8.25 (Content Management System). Affected is some unknown functionality of the component Theme XML File Handler. The manipulation with an unknown input leads to a sql injection vulnerability. CWE is classifying the issue as CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 03/16/2021. The advisory is available at github.com. This vulnerability is traded as CVE-2021-27890. Technical details are unknown but a public exploit is available. This vulnerability is assigned to T1505 by the MITRE ATT&CK project.

The exploit is shared for download at packetstormsecurity.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k.

Upgrading to version 1.8.26 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (49696). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Content Management System

Name

MyBB

Version

License

open-source

Website

Product: https://mybb.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.2

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Sql injection
CWE: CWE-89 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MyBB 1.8.26

Timelineinfo

03/02/2021 🔍
03/16/2021 +14 days 🔍
03/16/2021 +0 days 🔍
12/21/2024 +1376 days 🔍

Sourcesinfo

Product: mybb.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2021-27890 (🔍)
GCVE (CVE): GCVE-0-2021-27890
GCVE (VulDB): GCVE-100-171306
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/16/2021 11:06
Updated: 12/21/2024 13:54
Changes: 03/16/2021 11:06 (38), 04/01/2021 20:02 (5), 04/01/2021 20:10 (18), 06/09/2024 00:27 (22), 12/21/2024 13:54 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.