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Test ID:1.3.6.1.4.1.25623.1.0.107017
Category:Denial of Service
Title:Greenbone OS - Kernel Denial of Service Vulnerabilities - June 19
Summary:The Kernel in Greenbone OS is prone to multiple denial of service vulnerabilities.
Description:Summary:
The Kernel in Greenbone OS is prone to multiple denial of service vulnerabilities.

Vulnerability Insight:
Multiple TCP Selective Acknowledgement (SACK) and Maximum Segment Size (MSS)
networking vulnerabilities may cause denial-of-service conditions in Linux kernels as used
in Greenbone OS.

Vulnerability Impact:
A remote attacker could use this to cause a denial of service or kernel failure (panic) by:

- triggering an integer overflow (CVE-2019-11477)

- sending a sequence of specifically crafted selective acknowledgements (SACK),
that may cause a fragmented TCP queue (CVE-2019-11478)

- making use of the default maximum segment size (MSS), which is hard-coded to 48 bytes.
This may cause an increase of fragmented packets (CVE-2019-11479).

Affected Software/OS:
Greenbone OS prior to version 4.2.29, 4.3.14 or 5.0.3 respectively.

Solution:
Update to Greenbone OS 4.2.29, 4.3.14 or 5.0.3.

CVSS Score:
7.8

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-11477
Common Vulnerability Exposure (CVE) ID: CVE-2019-11478
Common Vulnerability Exposure (CVE) ID: CVE-2019-11479
CopyrightCopyright (C) 2019 Greenbone Networks GmbH

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