Kaspersky Anti-Virus up to 8.0.4 on Linux Quarantine 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.
8.4	$0-$5k	0.00

A vulnerability was found in Kaspersky Anti-Virus up to 8.0.4 on Linux (Anti-Malware Software). It has been classified as critical. This affects an unknown code block of the component Quarantine. The manipulation with an unknown input 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. The summary by CVE is:

The kluser is able to interact with the kav4fs-control binary in Kaspersky Anti-Virus for Linux File Server before Maintenance Pack 2 Critical Fix 4 (version 8.0.4.312). By abusing the quarantine read and write operations, it is possible to elevate the privileges to root.

The bug was discovered 06/28/2017. The weakness was released 07/17/2017 by Core Security with Core Security Consulting Services as confirmed mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. This vulnerability is uniquely identified as CVE-2017-9811 since 06/22/2017. Attacking locally is a requirement. The requirement for exploitation is a authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed by Core Security and been published even before and not after the advisory. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 19 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 8.0.4.312 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (42269). Entries connected to this vulnerability are available at 103730, 103732 and 103733.

Productinfo

Type

Anti-Malware Software

Vendor

Kaspersky

Name

Anti-Virus

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
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: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Core Security
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Anti-Virus 8.0.4.312

Timelineinfo

06/22/2017 🔍
06/28/2017 +6 days 🔍
06/28/2017 +0 days 🔍
06/28/2017 +0 days 🔍
06/29/2017 +1 days 🔍
07/17/2017 +18 days 🔍
07/17/2017 +0 days 🔍
07/18/2017 +1 days 🔍
12/13/2022 +1974 days 🔍

Sourcesinfo

Vendor: kaspersky.com

Advisory: 143190
Researcher: Core Security
Organization: Core Security Consulting Services
Status: Confirmed

CVE: CVE-2017-9811 (🔍)
SecurityTracker: 1038798
SecurityFocus: 99330 - Kaspersky Anti-Virus for Linux File Server Multiple Security Vulnerabilities

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

Entryinfo

Created: 07/18/2017 11:22
Updated: 12/13/2022 08:45
Changes: 07/18/2017 11:22 (75), 10/27/2019 07:40 (2), 01/01/2021 18:23 (2), 12/13/2022 08:45 (3)
Complete: 🔍
Cache ID: 3:2B3:103