sssd up to 2.0 chroot Empty String input validation

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.
4.7$0-$5k0.00

Summaryinfo

A vulnerability was found in sssd up to 2.0. It has been declared as critical. This affects the function chroot. The manipulation as part of Empty String results in input validation. This vulnerability is identified as CVE-2019-3811. The attack can only be performed from the local network. There is not any exploit available. Modifying the configuration settings is advised.

Detailsinfo

A vulnerability was found in sssd up to 2.0. It has been classified as critical. Affected is the function chroot. The manipulation as part of a Empty String leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A vulnerability was found in sssd. If a user was configured with no home directory set, sssd would return '/' (the root directory) instead of '' (the empty string / no home directory). This could impact services that restrict the user's filesystem access to within their home directory through chroot() etc. All versions before 2.1 are vulnerable.

The bug was discovered 01/14/2019. The weakness was released 01/15/2019 as confirmed bug report (Bugzilla). The advisory is available at bugzilla.redhat.com. This vulnerability is traded as CVE-2019-3811 since 01/03/2019. Access to the local network is required for this attack to succeed. Required for exploitation is a authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 121233 (Debian DLA-1635-1 : sssd 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 172144 (SUSE Enterprise Linux Security Update for sssd (SUSE-SU-2019:0556-1)).

It is possible to mitigate the problem by applying the configuration setting . A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (121233) and SecurityFocus (BID 106644†). Entry connected to this vulnerability is available at VDB-119983. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.9
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.2
NVD Vector: 🔍

CNA Base Score: 4.1
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 121233
Nessus Name: Debian DLA-1635-1 : sssd security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Config
Status: 🔍

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

Timelineinfo

01/03/2019 🔍
01/14/2019 +11 days 🔍
01/15/2019 +1 days 🔍
01/15/2019 +0 days 🔍
01/15/2019 +0 days 🔍
01/16/2019 +1 days 🔍
01/17/2019 +1 days 🔍
01/18/2019 +1 days 🔍
07/01/2023 +1625 days 🔍

Sourcesinfo

Advisory: RHSA-2019:2177
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-3811 (🔍)
GCVE (CVE): GCVE-0-2019-3811
GCVE (VulDB): GCVE-100-129786
SecurityFocus: 106644 - SSSD CVE-2019-3811 Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 01/16/2019 13:33
Updated: 07/01/2023 09:56
Changes: 01/16/2019 13:33 (75), 05/01/2020 18:14 (5), 07/01/2023 09:52 (4), 07/01/2023 09:56 (12)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!