Debian xscreensaver-command up to 0.8-9-2.4 libpam-rsa improper authentication

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.
7.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Debian xscreensaver-command up to 0.8-9-2.4. This impacts an unknown function in the library libpam-rsa. Such manipulation leads to improper authentication. Furthermore, an exploit is available. It is suggested to apply the recommended workaround.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Debian xscreensaver-command up to 0.8-9-2.4. Affected by this issue is some unknown functionality in the library libpam-rsa. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability.

The bug was discovered 11/12/2012. The weakness was published 11/12/2012 by Ian Zimmerman as 693358 as not defined advisory (Website). The advisory is shared for download at bugs.debian.org. The attack needs to be approached locally. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

After immediately, there has been an exploit disclosed. The exploit is available at bugs.debian.org. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at bugs.debian.org. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at OSVDB (91112†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Debian

Name

xscreensaver-command

Version

License

open-source

Website

Vendor: https://www.debian.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.4
VulDB Temp Score: 7.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

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: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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

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

Patch: bugs.debian.org

Timelineinfo

11/12/2012 🔍
11/12/2012 +0 days 🔍
11/12/2012 +0 days 🔍
12/17/2012 +35 days 🔍
03/11/2013 +84 days 🔍
05/04/2018 +1880 days 🔍

Sourcesinfo

Vendor: debian.org

Advisory: 693358
Researcher: Ian Zimmerman
Status: Not defined

GCVE (VulDB): GCVE-100-7940
OSVDB: 91112

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

Entryinfo

Created: 03/11/2013 14:16
Updated: 05/04/2018 09:08
Changes: 03/11/2013 14:16 (50), 05/04/2018 09:08 (1)
Complete: 🔍
Committer:
Cache ID: 216:B90:103