Web2py up to 2.14.1 gluon/utils.py secure_load Stored deserialization

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.
7.4	$0-$5k	0.00

A vulnerability was found in Web2py up to 2.14.1. It has been classified as problematic. This affects the function secure_load of the file gluon/utils.py. The manipulation with an unknown input leads to a deserialization vulnerability (Stored). CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality. The summary by CVE is:

The secure_load function in gluon/utils.py in web2py before 2.14.2 uses pickle.loads to deserialize session information stored in cookies, which might allow remote attackers to execute arbitrary code by leveraging knowledge of encryption_key.

The bug was discovered 04/05/2016. The weakness was published 02/06/2018 (Website). It is possible to read the advisory at devco.re. This vulnerability is uniquely identified as CVE-2016-3957 since 04/05/2016. 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 of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 672 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 2.14.2 eliminates this vulnerability.

Similar entries are available at VDB-112873 and VDB-112874.

Productinfo

Name

Web2py

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Stored
Class: Deserialization / Stored
CWE: CWE-502 / CWE-20
CAPEC: 🔍
ATT&CK: 🔍

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: Web2py 2.14.2

Timelineinfo

04/05/2016 🔍
04/05/2016 +0 days 🔍
02/06/2018 +672 days 🔍
02/06/2018 +0 days 🔍
02/07/2018 +1 days 🔍
02/03/2023 +1822 days 🔍

Sourcesinfo

Advisory: USN-4030-1
Status: Not defined

CVE: CVE-2016-3957 (🔍)
See also: 🔍

Entryinfo

Created: 02/07/2018 08:25 AM
Updated: 02/03/2023 04:14 PM
Changes: 02/07/2018 08:25 AM (61), 01/02/2020 08:07 AM (1), 02/03/2023 04:14 PM (4)
Complete: 🔍
Cache ID: 18:41D:40