Atlassian Bitbucket Server up to 5.7.0 Plugin Servlet input validation

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.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in Atlassian Bitbucket Server up to 5.3.6/5.4.5/5.5.5/5.6.2/5.7.0. The affected element is an unknown function of the component Plugin Servlet. Performing a manipulation results in input validation. This vulnerability is reported as CVE-2017-18088. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Atlassian Bitbucket Server up to 5.3.6/5.4.5/5.5.5/5.6.2/5.7.0. This affects some unknown processing of the component Plugin Servlet. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Various plugin servlet resources in Atlassian Bitbucket Server before version 5.3.7 (the fixed version for 5.3.x), from version 5.4.0 before 5.4.6 (the fixed version for 5.4.x), from version 5.5.0 before 5.5.6 (the fixed version for 5.5.x), from version 5.6.0 before 5.6.3 (the fixed version for 5.6.x), from version 5.7.0 before 5.7.1 (the fixed version for 5.7.x) and before 5.8.0 allow remote attackers to conduct clickjacking attacks via framing various resources that lacked clickjacking protection.

The bug was discovered 02/02/2018. The weakness was disclosed 02/15/2018 (Website). It is possible to read the advisory at jira.atlassian.com. This vulnerability is uniquely identified as CVE-2017-18088 since 02/01/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 13 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 5.3.7, 5.4.6, 5.5.6, 5.6.3 or 5.7.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 103040†). The entry VDB-113426 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Atlassian

Name

• Bitbucket Server

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6
• 5.4
• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.4.4
• 5.4.5
• 5.5
• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3
• 5.5.4
• 5.5.5
• 5.6
• 5.6.0
• 5.6.1
• 5.6.2
• 5.7.0

License

• free

Website

• Vendor: https://www.atlassian.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.3
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: Input validation
CWE: CWE-20
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: Bitbucket Server 5.3.7/5.4.6/5.5.6/5.6.3/5.7.1

Timelineinfo

02/01/2018 🔍
02/02/2018 +1 days 🔍
02/02/2018 +0 days 🔍
02/15/2018 +13 days 🔍
02/15/2018 +0 days 🔍
02/16/2018 +1 days 🔍
01/06/2020 +689 days 🔍

Sourcesinfo

Vendor: atlassian.com

Advisory: jira.atlassian.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-18088 (🔍)
GCVE (CVE): GCVE-0-2017-18088
GCVE (VulDB): GCVE-100-113427
SecurityFocus: 103040 - Atlassian Bitbucket Server CVE-2017-18088 Multiple Clickjacking Vulnerabilities

See also: 🔍

Entryinfo

Created: 02/16/2018 12:44
Updated: 01/06/2020 07:07
Changes: 02/16/2018 12:44 (62), 01/06/2020 07:07 (4)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

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