Suckless slock Screen Lock null pointer dereference

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

Summaryinfo

A vulnerability marked as problematic has been reported in Suckless slock. This affects an unknown part of the component Screen Lock. The manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2016-6866. It is possible to initiate the attack remotely. There is no exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Suckless slock (the affected version is unknown) and classified as problematic. This issue affects an unknown code of the component Screen Lock. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

slock allows attackers to bypass the screen lock via vectors involving an invalid password hash, which triggers a NULL pointer dereference and crash.

The bug was discovered 08/18/2016. The weakness was shared 02/15/2017 (oss-sec). The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2016-6866 since 08/18/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 93053 (Debian DLA-598-1 : suckless-tools 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 276133 (Fedora Security Update for slock (FEDORA-2016-1b7e66c08b)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.suckless.org. 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 (93053) and SecurityFocus (BID 92546†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 93053
Nessus Name: Debian DLA-598-1 : suckless-tools security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 871139
OpenVAS Name: Fedora Update for slock FEDORA-2016-7e817cbf55
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.suckless.org

Timelineinfo

08/18/2016 🔍
08/18/2016 +0 days 🔍
08/19/2016 +1 days 🔍
08/20/2016 +1 days 🔍
08/22/2016 +2 days 🔍
02/15/2017 +177 days 🔍
02/15/2017 +0 days 🔍
02/16/2017 +1 days 🔍
09/24/2024 +2777 days 🔍

Sourcesinfo

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

CVE: CVE-2016-6866 (🔍)
GCVE (CVE): GCVE-0-2016-6866
GCVE (VulDB): GCVE-100-96989
SecurityFocus: 92546 - slock CVE-2016-6866 NULL Pointer Dereference Denial of Service Vulnerability
OSVDB: - CVE-2016-6866 - slock - Security Bypass Issue

Entryinfo

Created: 02/16/2017 08:57
Updated: 09/24/2024 03:03
Changes: 02/16/2017 08:57 (71), 08/15/2020 06:52 (5), 09/24/2024 03:03 (19)
Complete: 🔍
Cache ID: 216::103

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