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.

Threat Intelligence

7/29/2019
09:00 AM

9 Things That Don't Worry You Today (But Should)

There are security concerns that go far beyond the usual suspects. Here are some that should be on your list of scary things.
2 of 10

ZIP Bombs

Since 1989, computer users have been taking advantage of Phil Katz's work in compression to reduce file sizes by as much as 1,032 to 1. The ZIP format is a common and critical component of file transfer in the enterprise, but the qualities that make it valuable can be used against an unwary recipient.

The 1,032 to 1 compression ratio is possible with DEFLATE, the compression algorithm used in most ZIPpers since the early 1990s. But by using other compression algorithms or techniques, much greater compression can be achieved. In a recent example, researcher David Fifield demonstrated a compression ratio of more than 28 million to 1, resulting in a 46MB ZIP file that decompresses to approximately 4.5PB of data.

Fifield has created code producing an even larger ZIP bomb, a 2.9GB file that unzips to 2*64 +11727895877 bytes, a data size expressed in zettabytes (two orders of magnitude beyond petabytes).

These very large ZIP bombs have, so far, been confined to research activities, but it's not hard to imagine a threat actor using the technique to perform a denial-of-service attack against the storage and computation resources of a company.

(Image Source: FrankBoston via Adobe Stock)

2 of 10
Comment  | 
Print  | 
Comments
Newest First  |  Oldest First  |  Threaded View
edshawn61
50%
50%
edshawn61,
User Rank: Apprentice
7/29/2019 | 6:43:43 PM
Great job
Your take on this topic is very interesting!
COVID-19: Latest Security News & Commentary
Dark Reading Staff 7/13/2020
Omdia Research Launches Page on Dark Reading
Tim Wilson, Editor in Chief, Dark Reading 7/9/2020
Mobile App Fraud Jumped in Q1 as Attackers Pivot from Browsers
Jai Vijayan, Contributing Writer,  7/10/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Special Report: Computing's New Normal, a Dark Reading Perspective
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
The Threat from the Internetand What Your Organization Can Do About It
The Threat from the Internetand What Your Organization Can Do About It
This report describes some of the latest attacks and threats emanating from the Internet, as well as advice and tips on how your organization can mitigate those threats before they affect your business. Download it today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-14174
PUBLISHED: 2020-07-13
Affected versions of Atlassian Jira Server and Data Center allow remote attackers to view titles of a private project via an Insecure Direct Object References (IDOR) vulnerability in the Administration Permission Helper. The affected versions are before version 7.13.6, from version 8.0.0 before 8.5....
CVE-2019-20901
PUBLISHED: 2020-07-13
The login.jsp resource in Jira before version 8.5.2, and from version 8.6.0 before version 8.6.1 allows remote attackers to redirect users to a different website which they may use as part of performing a phishing attack via an open redirect in the os_destination parameter.
CVE-2019-20898
PUBLISHED: 2020-07-13
Affected versions of Atlassian Jira Server and Data Center allow remote attackers to access sensitive information without being authenticated in the Global permissions screen. The affected versions are before version 8.8.0.
CVE-2019-20899
PUBLISHED: 2020-07-13
The Gadget API in Atlassian Jira Server and Data Center in affected versions allows remote attackers to make Jira unresponsive via repeated requests to a certain endpoint in the Gadget API. The affected versions are before version 8.5.4, and from version 8.6.0 before 8.6.1.
CVE-2019-20900
PUBLISHED: 2020-07-13
Affected versions of Atlassian Jira Server and Data Center allow remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the Add Field module. The affected versions are before version 8.7.0.