PT-2018-4911 · Web2Py+1 · Web2Py+1

Shaolin · Published 2018-02-06 · Updated 2022-05-14 · CVE-2016-3957

Positive Technologies (AI Summary)

CVSS v2.0

7.5

High

Base vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions web2py versions prior to 2.14.2

Description The issue allows remote attackers to execute arbitrary code by leveraging knowledge of encryption key, potentially through deserialization of session information stored in cookies using the pickle.loads function in gluon/utils.py. Additionally, the sample web application might allow remote attackers to execute arbitrary code via vectors involving use of a hardcoded encryption key when calling the session.connect function. It is also possible for remote attackers to obtain the session cookie key value via a direct request to "examples/simple examples/status", which can be leveraged to execute arbitrary code.

Recommendations For versions prior to 2.14.2, update to version 2.14.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the session.connect function and the examples/simple examples/status endpoint until a patch is available. Avoid using hardcoded encryption keys in the sample web application.

Exploit

Fix

RCE

Deserialization of Untrusted Data

Using Hardcoded Credentials

Information Disclosure

Weakness Enumeration

CWE-502

CWE-798

CWE-200

Related Identifiers

CVE-2016-3957

GHSA-JR83-VR4J-MP6P

GHSA-Q2RQ-QGCF-M22W

USN-4030-1

Affected Products

Ubuntu

Web2Py

References · 23

• 🔥 https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957 · Exploit
• https://ubuntu.com/security/CVE-2016-10321 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2016-3957 · Vendor Advisory
• https://usn.ubuntu.com/4030-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4030-1 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-q2rq-qgcf-m22w · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-3952 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-3954 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2016-3957 · Security Note
• https://ubuntu.com/security/notices/USN-4030-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-3954 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2016-3957 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-3953 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-3957 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-jr83-vr4j-mp6p · Vendor Advisory