VDB-145961 · CVE-2011-3349 · BID 50506

LightDM up to 0.9.5 Permission dmrc File Handler privileges management

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.
6.4	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in LightDM up to 0.9.5. This affects an unknown part of the component Permission. The manipulation as part of dmrc File Handler leads to privileges management. This vulnerability is documented as CVE-2011-3349. The attack needs to be performed locally. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in LightDM up to 0.9.5. It has been rated as critical. This issue affects an unknown code of the component Permission. The manipulation as part of a dmrc File Handler leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

lightdm before 0.9.6 writes in .dmrc and Xauthority files using root permissions while the files are in user controlled folders. A local user can overwrite root-owned files via a symlink, which can allow possible privilege escalation.

The bug was discovered 08/24/2011. The weakness was released 11/19/2019 by Sebastian Krahmer. The identification of this vulnerability is CVE-2011-3349 since 08/30/2011. An attack has to be approached locally. A simple authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 3009 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 0.9.6 eliminates this vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 50506†) and OSVDB (76892†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

LightDM

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

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: LightDM 0.9.6

Timelineinfo

08/24/2011 🔍
08/30/2011 +6 days 🔍
11/03/2011 +65 days 🔍
11/19/2019 +2938 days 🔍
11/20/2019 +1 days 🔍
02/23/2024 +1556 days 🔍

Sourcesinfo

Advisory: access.redhat.com
Researcher: Sebastian Krahmer
Status: Not defined

CVE: CVE-2011-3349 (🔍)
GCVE (CVE): GCVE-0-2011-3349
GCVE (VulDB): GCVE-100-145961
SecurityFocus: 50506 - LightDM Symlink Attack Local Privilege Escalation Vulnerability
OSVDB: 76892

Entryinfo

Created: 11/20/2019 07:18
Updated: 02/23/2024 18:56
Changes: 11/20/2019 07:18 (41), 11/20/2019 07:23 (21), 02/23/2024 18:56 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.