Vulnerability Details

Greenbone OS - Kernel Denial of Service Vulnerabilities - June 19

Published: 2019-06-21 09:11:07
CVE Author: NIST National Vulnerability Database

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

Summary:
The Kernel in Greenbone OS is prone to multiple denial of service vulnerabilities.

Technical Details:
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.

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).

Detection Method:
Checks if a vulnerable version is present on the target host.

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

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

Solution Type:
Vendor Patch

Detection Type:
Remote Banner

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2019-11477
https://nvd.nist.gov/vuln/detail/CVE-2019-11478
https://nvd.nist.gov/vuln/detail/CVE-2019-11479

References:

https://www.kb.cert.org/vuls/id/905115

Severity
High
CVSS Score
7.8
Published
2019-06-21
Modified
2019-06-21
Category
Denial of Service

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