Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

6/21/2019
01:53 PM
50%
50%

Four CVEs Describe SACKs of Linux and FreeBSD Vulnerabilities

Four new CVEs present issues that have a potential DoS impact on almost every Linux user.

Linux and FreeBSD users have a SACK of new vulnerabilities to worry about, as four new CVEs describe selective acknowledgement (SACK) and excess resource consumption vulnerabilities that can bring a system to a standstill from a denial of service attack.

Three of the CVEs — CVE-2019-11477, CVE-2019-11478, and CVE-2019-5599 — deal with a variety of different SACKs that can hit various Linux distributions and FreeBSD 12 using the RACK TCP Stack. In each case, a carefully crafted selective acknowledgement can trigger an issue that could lead to slowed performance, denial of service, or a kernel panic.

The fourth CVE, CVE-2019-11479, describes a vulnerability stemming from a hard-coded maximum segment size (MSS) that can result in a higher number of fragmented packets than normal. This issue for all Linux versions could be exploited to cause increased resource consumption in the CPU and network controller, with system slowdown or denial of service as the result.

Because of the nature of the Linux and FreeBSD communities, vendors and open-source projects are in various stages of releasing patches for these vulnerabilities. Users should contact their system provider to see whether a patch is already available for the distribution in use.

For more, read here and here.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
US Turning Up the Heat on North Korea's Cyber Threat Operations
Jai Vijayan, Contributing Writer,  9/16/2019
MITRE Releases 2019 List of Top 25 Software Weaknesses
Kelly Sheridan, Staff Editor, Dark Reading,  9/17/2019
7 Ways VPNs Can Turn from Ally to Threat
Curtis Franklin Jr., Senior Editor at Dark Reading,  9/21/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
7 Threats & Disruptive Forces Changing the Face of Cybersecurity
This Dark Reading Tech Digest gives an in-depth look at the biggest emerging threats and disruptive forces that are changing the face of cybersecurity today.
Flash Poll
The State of IT Operations and Cybersecurity Operations
The State of IT Operations and Cybersecurity Operations
Your enterprise's cyber risk may depend upon the relationship between the IT team and the security team. Heres some insight on what's working and what isn't in the data center.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2019-16695
PUBLISHED: 2019-09-22
phpIPAM 1.4 allows SQL injection via the app/admin/custom-fields/filter.php table parameter when action=add is used.
CVE-2019-16696
PUBLISHED: 2019-09-22
phpIPAM 1.4 allows SQL injection via the app/admin/custom-fields/edit.php table parameter when action=add is used.
CVE-2018-21018
PUBLISHED: 2019-09-22
Mastodon before 2.6.3 mishandles timeouts of incompletely established sessions.
CVE-2019-16692
PUBLISHED: 2019-09-22
phpIPAM 1.4 allows SQL injection via the app/admin/custom-fields/filter-result.php table parameter when action=add is used.
CVE-2019-16693
PUBLISHED: 2019-09-22
phpIPAM 1.4 allows SQL injection via the app/admin/custom-fields/order.php table parameter when action=add is used.