VDB-99924 · CVE-2016-4874 · BID 97719

Cybozu Office up to 10.4.0 File Download Reflected access control

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.
3.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Cybozu Office up to 10.4.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component File Download. The manipulation results in access control (Reflected). This vulnerability is cataloged as CVE-2016-4874. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Cybozu Office up to 10.4.0 (Office Suite Software). It has been classified as problematic. Affected is some unknown processing of the component File Download. The manipulation with an unknown input leads to a access control vulnerability (Reflected). CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on integrity. CVE summarizes:

Cybozu Office 9.0.0 through 10.4.0 allows remote attackers to conduct a "reflected file download" attack.

The bug was discovered 10/03/2016. The weakness was shared 04/17/2017 (Website). The advisory is shared for download at jvn.jp. This vulnerability is traded as CVE-2016-4874 since 05/17/2016. It is possible to launch the attack remotely. Required for exploitation is a authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 196 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 97719†). The entries VDB-99923, VDB-99922, VDB-99921 and VDB-99920 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Office Suite Software

Name

Cybozu Office

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 3.5
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

Name: Reflected
Class: Access control / Reflected
CWE: CWE-284 / CWE-266
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/17/2016 🔍
10/03/2016 +139 days 🔍
04/17/2017 +196 days 🔍
04/17/2017 +0 days 🔍
04/17/2017 +0 days 🔍
04/18/2017 +1 days 🔍
08/31/2020 +1231 days 🔍

Sourcesinfo

Advisory: jvn.jp
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-4874 (🔍)
GCVE (CVE): GCVE-0-2016-4874
GCVE (VulDB): GCVE-100-99924
SecurityFocus: 97719 - Cybozu Office CVE-2016-4874 Arbitrary File Download Vulnerability
OSVDB: - CVE-2016-4874 - Cybozu - Office - Reflected File Download Issue

See also: 🔍

Entryinfo

Created: 04/18/2017 10:34
Updated: 08/31/2020 16:39
Changes: 04/18/2017 10:34 (61), 08/31/2020 16:39 (4)
Complete: 🔍
Cache ID: 216::103