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

Malware: The Undead

Thanks to cache servers, some malicious code lives on - even after it has supposedly been eradicated

Is there life after death? If you're malicious HTML code, there might be.

Researchers at Finjan Software Inc. say they have uncovered several instances in which malware from previously disabled Web sites or pages has reappeared, served up by caching systems that don't recognize the trouble.

"Such 'infection-by-proxy' introduces new risks for businesses," says Finjan's Malicious Code Research Center in its quarterly Web security trends report. "This is more than just a theoretical danger -- Finjan has already found such a scenario being used in the wild."

ISPs, search engines, and large enterprises often create large stores of cached Web pages on their systems to provide backup when a Web page is unavailable or slow to load, Finjan observes. These duplicate pages live on, even after a malicious site has been taken down or quarantined.

When the cached pages are served up, they carry with them whatever malware may have been attached to the original page via HTML or JavaScript. This malware can be used to install spyware or Trojan horses, even after the threat has supposedly been eradicated.

"Traditional security solutions might not be effective against this type of threat," Finjan says. URL filtering technology, for example, might block the original malicious site, but caching sites are generally treated as legitimate, the researchers observe. Anti-virus technology may also fail to catch the problem, because some malicious Websites are taken down before their exploits have a chance to build a virus signature.

Finjan advises enterprises and ISPs that use caching servers to perform periodic checks of their cached content using proactive, behavior-based security software.

— Tim Wilson, Site Editor, Dark Reading

Tim Wilson is Editor in Chief and co-founder of Dark Reading.com, UBM Tech's online community for information security professionals. He is responsible for managing the site, assigning and editing content, and writing breaking news stories. Wilson has been recognized as one ... View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 7/14/2020
Omdia Research Launches Page on Dark Reading
Tim Wilson, Editor in Chief, Dark Reading 7/9/2020
Why Cybersecurity's Silence Matters to Black Lives
Tiffany Ricks, CEO, HacWare,  7/8/2020
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-2020-14499
PUBLISHED: 2020-07-15
Advantech iView, versions 5.6 and prior, has an improper access control vulnerability. Successful exploitation of this vulnerability may allow an attacker to obtain all user accounts credentials.
CVE-2020-14501
PUBLISHED: 2020-07-15
Advantech iView, versions 5.6 and prior, has an improper authentication for critical function (CWE-306) issue. Successful exploitation of this vulnerability may allow an attacker to obtain the information of the user table, including the administrator credentials in plain text. An attacker may also ...
CVE-2020-14503
PUBLISHED: 2020-07-15
Advantech iView, versions 5.6 and prior, has an improper input validation vulnerability. Successful exploitation of this vulnerability could allow an attacker to remotely execute arbitrary code.
CVE-2020-14497
PUBLISHED: 2020-07-15
Advantech iView, versions 5.6 and prior, contains multiple SQL injection vulnerabilities that are vulnerable to the use of an attacker-controlled string in the construction of SQL queries. An attacker could extract user credentials, read or modify information, and remotely execute code.
CVE-2020-14505
PUBLISHED: 2020-07-15
Advantech iView, versions 5.6 and prior, has an improper neutralization of special elements used in a command (“command injection�) vulnerability. Successful exploitation of this vulnerability may allow an attacker to send a HTTP GET or POST request that create...