shadow 4.2.1 newuidmap integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in shadow 4.2.1. The affected element is an unknown function of the component newuidmap Handler. The manipulation leads to integer overflow. This vulnerability is listed as CVE-2016-6252. The attack must be carried out locally. There is no available exploit. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in shadow 4.2.1. This issue affects some unknown processing of the component newuidmap Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow in shadow 4.2.1 allows local users to gain privileges via crafted input to newuidmap.

The bug was discovered 05/10/2016. The weakness was presented 02/17/2017 (Website). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2016-6252 since 07/20/2016. Attacking locally is a requirement. Required for exploitation is a simple authentication. 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 283 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 97397 (Debian DSA-3793-1 : shadow - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171281 (SUSE Enterprise Linux Security Update for shadow (SUSE-SU-2018:1997-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published 1 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (97397) and SecurityFocus (BID 92055†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 7.8
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: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 97397
Nessus Name: Debian DSA-3793-1 : shadow - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703793
OpenVAS Name: Debian Security Advisory DSA 3793-1 (shadow - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

05/10/2016 🔍
07/19/2016 +70 days 🔍
07/20/2016 +1 days 🔍
02/17/2017 +212 days 🔍
02/17/2017 +0 days 🔍
02/18/2017 +1 days 🔍
02/24/2017 +6 days 🔍
02/27/2017 +3 days 🔍
08/15/2020 +1265 days 🔍

Sourcesinfo

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

CVE: CVE-2016-6252 (🔍)
GCVE (CVE): GCVE-0-2016-6252
GCVE (VulDB): GCVE-100-97103

OVAL: 🔍

SecurityFocus: 92055 - Shadow Multiple Local Security Vulnerabilities
OSVDB: - CVE-2016-6252 - shadow - Integer Overflow Issue

Entryinfo

Created: 02/18/2017 08:59
Updated: 08/15/2020 18:07
Changes: 02/18/2017 08:59 (76), 08/15/2020 18:07 (6)
Complete: 🔍
Cache ID: 216:5F0:103

Be aware that VulDB is the high quality source for vulnerability data.

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