MyBB up to 1.8.10 Smilie pathfolder path traversal

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.
5.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in MyBB up to 1.8.10. It has been rated as critical. The impacted element is an unknown function of the component Smilie Module. Performing a manipulation of the argument pathfolder results in path traversal. This vulnerability is cataloged as CVE-2017-8104. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in MyBB up to 1.8.10 (Content Management System). This affects an unknown function of the component Smilie Module. The manipulation of the argument pathfolder with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, and integrity. The summary by CVE is:

In MyBB before 1.8.11, the smilie module allows Directory Traversal via the pathfolder parameter.

The bug was discovered 04/09/2017. The weakness was shared 04/24/2017 by Zhiyang Zeng (Website). The advisory is shared at seclists.org. This vulnerability is uniquely identified as CVE-2017-8104 since 04/24/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 15 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 1.8.11 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 98045†). The entry VDB-100568 is related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Name

• MyBB

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7
• 1.8.8
• 1.8.9
• 1.8.10

License

• open-source

Website

• Product: https://mybb.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
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: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MyBB 1.8.11

Timelineinfo

04/09/2017 🔍
04/24/2017 +15 days 🔍
04/24/2017 +0 days 🔍
04/24/2017 +0 days 🔍
04/24/2017 +0 days 🔍
04/25/2017 +1 days 🔍
09/20/2020 +1244 days 🔍

Sourcesinfo

Product: mybb.com

Advisory: seclists.org
Researcher: Zhiyang Zeng
Status: Not defined

CVE: CVE-2017-8104 (🔍)
GCVE (CVE): GCVE-0-2017-8104
GCVE (VulDB): GCVE-100-100569
SecurityFocus: 98045 - MyBB CVE-2017-8104 Directory Traversal Vulnerability
OSVDB: - CVE-2017-8104 - MyBB - Directory Traversal Issue

See also: 🔍

Entryinfo

Created: 04/25/2017 09:04
Updated: 09/20/2020 21:01
Changes: 04/25/2017 09:04 (62), 09/20/2020 21:01 (5)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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