LightDM up to 1.22.0 debian/guest-account.sh path traversal

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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in LightDM up to 1.22.0. The affected element is an unknown function of the file debian/guest-account.sh. This manipulation causes path traversal. This vulnerability is registered as CVE-2017-7358. The attack needs to be launched locally. Furthermore, an exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in LightDM up to 1.22.0. Affected by this vulnerability is some unknown functionality of the file debian/guest-account.sh. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows local attackers to own arbitrary directory path locations and escalate privileges to root when the guest user logs out.

The bug was discovered 04/18/2017. The weakness was published 04/05/2017 (Website). The advisory is shared at bazaar.launchpad.net. This vulnerability is known as CVE-2017-7358 since 03/30/2017. An attack has to be approached locally. A single authentication is required for exploitation. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1006 for this issue.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 99196 (Ubuntu 16.04 LTS / 16.10 : lightdm vulnerability (USN-3255-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196751 (Ubuntu Security Notification for Lightdm Vulnerability (USN-3255-1)).

Upgrading 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 Exploit-DB (41923), Tenable (99196) and SecurityFocus (BID 97486†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.8
VulDB Meta Temp Score: 5.6

VulDB Base Score: 4.4
VulDB Temp Score: 4.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.3
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CVSSv2info

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Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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Nessus ID: 99196
Nessus Name: Ubuntu 16.04 LTS / 16.10 : lightdm vulnerability (USN-3255-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for lightdm USN-3255-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/30/2017 🔍
04/04/2017 +5 days 🔍
04/05/2017 +1 days 🔍
04/05/2017 +0 days 🔍
04/05/2017 +0 days 🔍
04/05/2017 +0 days 🔍
04/06/2017 +1 days 🔍
04/18/2017 +12 days 🔍
08/24/2024 +2685 days 🔍

Sourcesinfo

Advisory: USN-3255-1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7358 (🔍)
GCVE (CVE): GCVE-0-2017-7358
GCVE (VulDB): GCVE-100-99325
SecurityFocus: 97486 - LightDM CVE-2017-7358 Local Directory Traversal Vulnerability
OSVDB: - CVE-2017-7358 - LightDM - Directory Traversal Issue

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/06/2017 10:44
Updated: 08/24/2024 07:39
Changes: 04/06/2017 10:44 (68), 08/26/2020 07:38 (10), 11/27/2022 08:48 (4), 11/27/2022 08:49 (1), 08/24/2024 07:39 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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