puppet up to 4.10.0 YAML Deserialization deserialization

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in puppet up to 4.10.0. Affected by this issue is some unknown functionality of the component YAML Deserialization. Performing a manipulation results in deserialization. This vulnerability is reported as CVE-2017-2295. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in puppet up to 4.10.0 (Service Management Software). It has been classified as critical. This affects some unknown processing of the component YAML Deserialization. The manipulation with an unknown input leads to a deserialization vulnerability. 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, integrity, and availability. The summary by CVE is:

Versions of Puppet prior to 4.10.1 will deserialize data off the wire (from the agent to the server, in this case) with a attacker-specified format. This could be used to force YAML deserialization in an unsafe manner, which would lead to remote code execution. This change constrains the format of data on the wire to PSON or safely decoded YAML.

The bug was discovered 05/11/2017. The weakness was disclosed 07/05/2017 (Website). The advisory is shared at puppet.com. This vulnerability is uniquely identified as CVE-2017-2295 since 12/01/2016. It is possible to initiate the attack remotely. Required for exploitation is a authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101002 (Amazon Linux AMI : puppet3 (ALAS-2017-849)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196803 (Ubuntu Security Notification for Puppet Vulnerabilities (USN-3308-1)).

Upgrading to version 4.10.1 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101002) and SecurityFocus (BID 98582†). The entry VDB-72889 is pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.0
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.2
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101002
Nessus Name: Amazon Linux AMI : puppet3 (ALAS-2017-849)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703862
OpenVAS Name: Debian Security Advisory DSA 3862-1 (puppet - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: puppet 4.10.1

Timelineinfo

12/01/2016 🔍
05/11/2017 +161 days 🔍
05/11/2017 +0 days 🔍
06/22/2017 +42 days 🔍
06/23/2017 +1 days 🔍
07/05/2017 +12 days 🔍
07/05/2017 +0 days 🔍
07/06/2017 +1 days 🔍
10/22/2019 +838 days 🔍

Sourcesinfo

Advisory: puppet.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-2295 (🔍)
GCVE (CVE): GCVE-0-2017-2295
GCVE (VulDB): GCVE-100-103137

OVAL: 🔍

SecurityFocus: 98582 - Multiple Puppet Products YAML Deserialization CVE-2017-2295 Remote Code Execution Vulnerability

See also: 🔍

Entryinfo

Created: 07/06/2017 10:57
Updated: 10/22/2019 18:18
Changes: 07/06/2017 10:57 (75), 10/22/2019 18:18 (5)
Complete: 🔍
Cache ID: 216::103

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

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