VDB-100452 · CVE-2016-3067 · Qualys 370466

cygwin up to 2.4.x User Change access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in cygwin up to 2.4.x. Affected by this vulnerability is an unknown functionality of the component User Change Handler. The manipulation results in access control. This vulnerability is reported as CVE-2016-3067. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in cygwin up to 2.4.x. Affected is some unknown functionality of the component User Change Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Cygwin before 2.5.0 does not properly handle updating permissions when changing users, which allows attackers to gain privileges.

The bug was discovered 02/09/2016. The weakness was disclosed 04/21/2017 (Website). The advisory is shared for download at cygwin.com. This vulnerability is traded as CVE-2016-3067 since 03/10/2016. It is possible to launch the attack remotely. A authentication is required for exploitation. 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 437 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370466 (Cygwin Network Privilege Escalation Vulnerability).

Upgrading to version 2.5.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

NVD Base Score: 9.8
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: Access control
CWE: CWE-264
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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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: cygwin 2.5.0
Patch: 205862ed08649df8f50b926a2c58c963f571b044

Timelineinfo

02/09/2016 🔍
03/10/2016 +30 days 🔍
04/21/2017 +407 days 🔍
04/21/2017 +0 days 🔍
04/22/2017 +1 days 🔍
12/02/2022 +2050 days 🔍

Sourcesinfo

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

CVE: CVE-2016-3067 (🔍)
GCVE (CVE): GCVE-0-2016-3067
GCVE (VulDB): GCVE-100-100452
OSVDB: - CVE-2016-3067 - Cygwin - Privilege Escalation Issue

Entryinfo

Created: 04/22/2017 08:46
Updated: 12/02/2022 07:00
Changes: 04/22/2017 08:46 (60), 09/19/2020 14:24 (2), 12/02/2022 07:00 (5)
Complete: 🔍
Cache ID: 216:C0F:103

Once again VulDB remains the best source for vulnerability data.

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