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

Nginx Patches Critical Web Server Software Vulnerability

Meanwhile, hackers behind Cdorked malware that targets Apache servers now have extended it to infect open-source Nginx and Lighttpd server software.

Anonymous: 10 Things We Have Learned In 2013
Anonymous: 10 Things We Have Learned In 2013
(click image for larger view and for slideshow)
The developers behind the popular open-source Web server software Nginx have released updates to patch a serious vulnerability.

Nginx Tuesday announced the release of nginx-1.4.1 -- as well as "development version" nginx-1.5.0 -- to fix a buffer-overflow vulnerability that attackers could exploit to execute arbitrary code on a Ngnix server and completely compromise it. In a security advisory issued Tuesday, Nginx said the bug is present in Nginx versions 1.3.9 and 1.4.0. "The problem is fixed in nginx 1.5.0 [and] 1.4.1," it said.

The vulnerability rates as "highly critical," according to a security advisory issued by vulnerability research firm Secunia. "The vulnerability is caused due to an error within [a] function ... when parsing an HTTP chunk and can be exploited to cause a stack-based buffer overflow," it said.

[ Another U.S. hack leads back to China. Read China Tied To 3-Year Hack Of Defense Contractor. ]

Nginx -- pronounced "engine X" -- is an open-source Web server, reverse proxy server, and load balancer designed for a large number of concurrent connections and high levels of performance but with a low memory footprint. It runs on Unix, Linux, Solaris and Windows, as well as AIX, BSD variants, HP-UX and Mac OS X.

Nginx is now the third most popular HTTP Web server software, behind Apache and Microsoft ISS, although its popularity continues to increase. "Nginx reached a new milestone this month: it is now used by more than 100M websites, and within the million busiest websites has overtaken Microsoft IIS to take second place with a market share of 13.5%," said a May 2013 Web server report released by Netcraft.

"Overall, Nginx's market share now stands at 15.5%, just 1.2 percentage points behind Microsoft, helped by a growth of 8.3M sites this month," it said.

The growing popularity of Nginx, however, has made it a target for attackers. Notably, the developers behind the Cdorked malware that targets Linux systems running Apache HTTP server software recently updated the malware to exploit Nginx, as well as open-source Lighttpd ("lighty") Web server software.

To date, Cdorked infections have been confirmed in about 400 Web servers, 50 of which rank in the Alexa index of the top 100,000 websites. But security researchers don't yet know how attackers are infecting servers with the backdoor malware.

"We still don't know for sure how this malicious software was deployed on the Web servers," said Marc-Etienne M. Leveille, a malware researcher at security firm ESET, in a blog post. "We believe the infection vector is not unique. It cannot be attributed solely to installations of cPanel because only a fraction of the infected servers are using this management software."

"One thing is clear, this malware does not propagate by itself and it does not exploit a vulnerability in a specific software," he said. "Linux/Cdorked.A is a backdoor, used by [a] malicious actor to serve malicious content from legitimate websites."

Interestingly, the malware "is even more stealthy than we first thought," he said. "By analyzing how the attackers are configuring the backdoor, we found it will not deliver malicious content if the victim's IP address is in a very long list of blacklisted IP ranges, nor if the victim's Internet browser's language is set to Japanese, Finnish, Russian and Ukrainian, Kazakh or Belarusian." In those cases, the malware is instead set to redirect users to a "page with links to pornographic websites," said Leveille.

ESET researchers have also clarified the relationship between CDorked and the Apache-targeting Darkleech (aka Chapro) malware attacks, which has continued to intensify in recent months. "While both target Apache servers, they are distinct pieces of code and send visitors to different instances of the Blackhole kit," said ESET malware researcher Sébastien Duquette. "However this does not change the fact that this trend is quite concerning."

 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 7/9/2020
Introducing 'Secure Access Service Edge'
Rik Turner, Principal Analyst, Infrastructure Solutions, Omdia,  7/3/2020
Russian Cyber Gang 'Cosmic Lynx' Focuses on Email Fraud
Kelly Sheridan, Staff Editor, Dark Reading,  7/7/2020
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-2020-15001
PUBLISHED: 2020-07-09
An information leak was discovered on Yubico YubiKey 5 NFC devices 5.0.0 to 5.2.6 and 5.3.0 to 5.3.1. The OTP application allows a user to set optional access codes on OTP slots. This access code is intended to prevent unauthorized changes to OTP configurations. The access code is not checked when u...
CVE-2020-15092
PUBLISHED: 2020-07-09
In TimelineJS before version 3.7.0, some user data renders as HTML. An attacker could implement an XSS exploit with maliciously crafted content in a number of data fields. This risk is present whether the source data for the timeline is stored on Google Sheets or in a JSON configuration file. Most T...
CVE-2020-15093
PUBLISHED: 2020-07-09
The tough library (Rust/crates.io) prior to version 0.7.1 does not properly verify the threshold of cryptographic signatures. It allows an attacker to duplicate a valid signature in order to circumvent TUF requiring a minimum threshold of unique signatures before the metadata is considered valid. A ...
CVE-2020-15299
PUBLISHED: 2020-07-09
A reflected Cross-Site Scripting (XSS) Vulnerability in the KingComposer plugin through 2.9.4 for WordPress allows remote attackers to trick a victim into submitting an install_online_preset AJAX request containing base64-encoded JavaScript (in the kc-online-preset-data POST parameter) that is execu...
CVE-2020-4173
PUBLISHED: 2020-07-09
IBM Guardium Activity Insights 10.6 and 11.0 does not set the secure attribute on authorization tokens or session cookies. Attackers may be able to get the cookie values by sending a http:// link to a user or by planting this link in a site the user goes to. The cookie will be sent to the insecure l...