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The Hacker News - Cybersecurity News and Analysis: server security

New OpenSMTPD RCE Flaw Affects Linux and OpenBSD Email Servers

New OpenSMTPD RCE Flaw Affects Linux and OpenBSD Email Servers
February 25, 2020Mohit Kumar
OpenSMTPD has been found vulnerable to yet another critical vulnerability that could allow remote attackers to take complete control over email servers running BSD or Linux operating systems. OpenSMTPD , also known as OpenBSD SMTP Server, is an open-source implementation of the Simple Mail Transfer Protocol (SMTP) to deliver messages on a local machine or to relay them to other SMTP servers. It was initially developed as part of the OpenBSD project but now comes pre-installed on many UNIX-based systems. Discovered by experts at Qualys Research Labs, who also reported a similar RCE flaw in the email server application last month, the latest out-of-bounds read issue, tracked as  CVE-2020-8794 , resides in a component of the OpenSMTPD's client-side code that was introduced nearly 5 years ago. Just like the previous issue, which attackers started exploiting in the wild just a day after its public disclosure, the new OpenSMTPD flaw could also let remote hackers execute arbit

Microsoft Azure Flaws Could Have Let Hackers Take Over Cloud Servers

Microsoft Azure Flaws Could Have Let Hackers Take Over Cloud Servers
January 30, 2020Mohit Kumar
Cybersecurity researchers at Check Point today disclosed details of two recently patched potentially dangerous vulnerabilities in Microsoft Azure services that, if exploited, could have allowed hackers to target several businesses that run their web and mobile apps on Azure. Azure App Service is a fully-managed integrated service that enables users to create web and mobile apps for any platform or device, and easily integrate them with SaaS solutions, on-premises apps to automate business processes. According to a report researchers shared with The Hacker News, the first security vulnerability ( CVE-2019-1234 ) is a request spoofing issue that affected Azure Stack, a hybrid cloud computing software solution by Microsoft. If exploited, the issue would have enabled a remote hacker to unauthorizedly access screenshots and sensitive information of any virtual machine running on Azure infrastructure—it doesn't matter if they're running on a shared, dedicated or isolated vir

250 Million Microsoft Customer Support Records Exposed Online

250 Million Microsoft Customer Support Records Exposed Online
January 22, 2020Wang Wei
If you have ever contacted Microsoft for support in the past 14 years, your technical query, along with some personally identifiable information might have been compromised. Microsoft today admitted a security incident that exposed nearly 250 million "Customer Service and Support" (CSS) records on the Internet due to a misconfigured server containing logs of conversations between its support team and customers. According to Bob Diachenko, a cybersecurity researcher who spotted the unprotected database and reported to Microsoft, the logs contained records spanning from 2005 right through to December 2019. In a blog post, Microsoft confirmed that due to misconfigured security rules added to the server in question on December 5, 2019, enabled exposure of the data, which remained the same until engineers remediated the configuration on December 31, 2019. Microsoft also said that the database was redacted using automated tools to remove the personally identifiable info

Citrix Releases Patches for Critical ADC Vulnerability Under Active Attack

Citrix Releases Patches for Critical ADC Vulnerability Under Active Attack
January 20, 2020Mohit Kumar
Citrix has finally started rolling out security patches for a critical vulnerability in ADC and Gateway software that attackers started exploiting in the wild earlier this month after the company announced the existence of the issue without releasing any permanent fix. I wish I could say, "better late than never," but since hackers don't waste time or miss any opportunity to exploit vulnerable systems, even a short window of time resulted in the compromise of hundreds of Internet exposed Citrix ADC and Gateway systems. As explained earlier on The Hacker News, the vulnerability, tracked as CVE-2019-19781 , is a path traversal issue that could allow unauthenticated remote attackers to execute arbitrary code on several versions of Citrix ADC and Gateway products, as well as on the two older versions of Citrix SD-WAN WANOP. Rated critical with CVSS v3.1 base score 9.8, the issue was discovered by Mikhail Klyuchnikov, a security researcher at Positive Technologies, w

PoC Exploits Released for Citrix ADC and Gateway RCE Vulnerability

PoC Exploits Released for Citrix ADC and Gateway RCE Vulnerability
January 11, 2020Wang Wei
It's now or never to prevent your enterprise servers running vulnerable versions of Citrix application delivery, load balancing, and Gateway solutions from getting hacked by remote attackers. Why the urgency? Earlier today, multiple groups publicly released weaponized proof-of-concept exploit code [ 1 , 2 ] for a recently disclosed remote code execution vulnerability in Citrix's NetScaler ADC and Gateway products that could allow anyone to leverage them to take full control over potential enterprise targets. Just before the last Christmas and year-end holidays, Citrix announced that its Citrix Application Delivery Controller (ADC) and Citrix Gateway are vulnerable to a critical path traversal flaw (CVE-2019-19781) that could allow an unauthenticated attacker to perform arbitrary code execution on vulnerable servers. Citrix confirmed that the flaw affects all supported version of the software, including: Citrix ADC and Citrix Gateway version 13.0 all supported build

Dozens of Severe Flaws Found in 4 Popular Open Source VNC Software

Dozens of Severe Flaws Found in 4 Popular Open Source VNC Software
November 23, 2019Swati Khandelwal
Four popular open-source VNC remote desktop applications have been found vulnerable to a total of 37 security vulnerabilities, many of which went unnoticed for the last 20 years and most severe could allow remote attackers to compromise a targeted system. VNC (virtual network computing) is an open source graphical desktop sharing protocol based on RFB (Remote FrameBuffer) that allows users to remotely control another computer, similar to Microsoft's RDP service. The implementation of the VNC system includes a "server component," which runs on the computer sharing its desktop, and a "client component," which runs on the computer that will access the shared desktop. In other words, VNC allows you to use your mouse and keyboard to work on a remote computer as if you are sitting in front of it. There are numerous VNC applications, both free and commercial, compatible with widely used operating systems like Linux, macOS, Windows, and Android. Considering

Explained: How New 'Delegated Credentials' Boosts TLS Protocol Security

Explained: How New 'Delegated Credentials' Boosts TLS Protocol Security
November 06, 2019Mohit Kumar
Mozilla, in partnership with Facebook, Cloudflare, and other IETF community members, has announced technical specifications for a new cryptographic protocol called " Delegated Credentials for TLS ." Delegated Credentials for TLS is a new simplified way to implement "short-lived" certificates without sacrificing the reliability of secure connections. In short, the new TLS protocol extension aims to effectively prevent the misuse of stolen certificates by reducing their maximum validity period to a very short span of time, such as a few days or even hours. Before jumping into how Delegated Credentials for TLS works, you need to understand the current TLS infrastructure, and of course, about the core problem in it because of which we need Delegated Credentials for TLS. The Current TLS Infrastructure More than 70% of all websites on the Internet today use TLS certificates to establish a secure line of HTTPS communication between their servers and visitors,

New Cache Poisoning Attack Lets Attackers Target CDN Protected Sites

New Cache Poisoning Attack Lets Attackers Target CDN Protected Sites
October 23, 2019Swati Khandelwal
A team of German cybersecurity researchers has discovered a new cache poisoning attack against web caching systems that could be used by an attacker to force a targeted website into delivering error pages to most of its visitors instead of legitimate content or resources. The issue could affect sites running behind reverse proxy cache systems like Varnish and some widely-used Content Distribution Networks (CDNs) services, including Amazon CloudFront, Cloudflare, Fastly, Akamai, and CDN77. In brief, a Content Distribution Network (CDN) is a geographically distributed group of servers that sit between the origin server of a website and its visitors to optimize the performance of the website. A CDN service simply stores/caches static files—including HTML pages, JavaScript files, stylesheets, images, and videos—from the origin server and delivers them to visitors more quickly without going back to the originating server again and again. Each of the geographically distributed CDN se

Exim TLS Flaw Opens Email Servers to Remote 'Root' Code Execution Attacks

Exim TLS Flaw Opens Email Servers to Remote 'Root' Code Execution Attacks
September 06, 2019Mohit Kumar
A critical remote code execution vulnerability has been discovered in the popular open-source Exim email server software, leaving at least over half a million email servers vulnerable to remote hackers. Exim maintainers today released Exim version 4.92.2 after publishing an early warning two days ago, giving system administrators a heads-up on its upcoming security patches that affect all versions of the email server software up to and including then-latest 4.92.1. Exim is a widely used, open source mail transfer agent (MTA) software developed for Unix-like operating systems such as Linux, Mac OSX or Solaris, which runs almost 60% of the internet's email servers today for routing, delivering and receiving email messages. Tracked as CVE-2019-15846 , the security vulnerability only affects Exim servers that accept TLS connections, potentially allowing attackers to gain root-level access to the system "by sending an SNI ending in a backslash-null sequence during the ini

A New 'Arbitrary File Copy' Flaw Affects ProFTPD Powered FTP Servers

A New 'Arbitrary File Copy' Flaw Affects ProFTPD Powered FTP Servers
July 23, 2019Swati Khandelwal
A German security researcher has publicly disclosed details of a serious vulnerability in one of the most popular FTP server applications, which is currently being used by more than one million servers worldwide. The vulnerable software in question is ProFTPD , an open source FTP server used by a large number of popular businesses and websites including SourceForge, Samba and Slackware, and comes pre-installed with many Linux and Unix distributions, like Debian. Discovered by Tobias Mädel , the vulnerability resides in the mod_copy module of the ProFTPD application, a component that allows users to copy files/directories from one place to another on a server without having to transfer the data to the client and back. According to Mädel, an incorrect access control issue in the mod_copy module could be exploited by an authenticated user to unauthorizedly copy any file on a specific location of the vulnerable FTP server where the user is otherwise not allowed to write a file.

Baltimore City Shuts Down Most of Its Servers After Ransomware Attack

Baltimore City Shuts Down Most of Its Servers After Ransomware Attack
May 08, 2019Swati Khandelwal
For the second time in just over a year, the city of Baltimore has been hit by a ransomware attack, affecting its computer network and forcing officials to shut down a majority of its computer servers as a precaution. Ransomware works by encryption files and locking them up so users can't access them. The attackers then demand a ransom amount, typically in Bitcoin digital currency, in exchange for the decryption keys use to unlock the files. The ransomware attack on the Baltimore City Hall took place on Tuesday morning and infected the city's technology systems with an unknown ransomware virus, which according to government officials, is apparently spreading throughout their network. According to new Baltimore Mayor Bernard C. Jack Young, Baltimore City's critical public safety systems, such as 911, 311, emergency medical services and the fire department, are operational and not affected by the ransomware attack. Young also says the city technology officials are

Hackers Found Exploiting Oracle WebLogic RCE Flaw to Spread Ransomware

Hackers Found Exploiting Oracle WebLogic RCE Flaw to Spread Ransomware
May 01, 2019Mohit Kumar
Taking advantage of newly disclosed and even patched vulnerabilities has become common among cybercriminals, which makes it one of the primary attack vectors for everyday-threats, like crypto-mining, phishing, and ransomware. As suspected, a recently-disclosed critical vulnerability in the widely used Oracle WebLogic Server has now been spotted actively being exploited to distribute a never-before-seen ransomware variant, which researchers dubbed " Sodinokibi ." Last weekend, The Hacker News learned about a critical deserialization remote code execution vulnerability in Oracle WebLogic Server that could allow attackers to remotely run arbitrary commands on the affected servers just by sending a specially crafted HTTP request—without requiring any authorization. To address this vulnerability (CVE-2019-2725), which affected all versions of the Oracle WebLogic software and was given a severity score of 9.8 out of 10, Oracle rolled out an out-of-band security update on

Over 100 Million JustDial Users' Personal Data Found Exposed On the Internet

Over 100 Million JustDial Users' Personal Data Found Exposed On the Internet
April 17, 2019Mohit Kumar
An unprotected database belonging to JustDial , India's largest local search service, is leaking personally identifiable information of its every customer in real-time who accessed the service via its website, mobile app, or even by calling on its fancy "88888 88888" customer care number, The Hacker News has learned and independently verified. Founded over two decades ago, JustDial (JD) is the oldest and leading local search engine in India that allows users to find relevant nearby providers and vendors of various products and services quickly while helping businesses listed in JD to market their offerings. Rajshekhar Rajaharia , an independent security researcher, yesterday contacted The Hacker News and shared details of how an unprotected, publicly accessible API endpoint of JustDial's database can be accessed by anyone to view profile information of over 100 million users associated with their mobile numbers. The leaked data includes JustDial users' na

Apache Tomcat Patches Important Remote Code Execution Flaw

Apache Tomcat Patches Important Remote Code Execution Flaw
April 15, 2019Wang Wei
The Apache Software Foundation (ASF) has released new versions of its Tomcat application server to address an important security vulnerability that could allow a remote attacker to execute malicious code and take control of an affected server. Developed by ASF, Apache Tomcat is an open source web server and servlet system, which uses several Java EE specifications such as Java Servlet, JavaServer Pages (JSP), Expression Language, and WebSocket to provide a "pure Java" HTTP web server environment for Java concept to run in. The remote code execution vulnerability ( CVE-2019-0232 ) resides in the Common Gateway Interface (CGI) Servlet when running on Windows with enableCmdLineArguments enabled and occurs due to a bug in the way the Java Runtime Environment (JRE) passes command line arguments to Windows. Since the CGI Servlet is disabled by default and its option enableCmdLineArguments is disabled by default in Tomcat 9.0.x, the remote code execution vulnerability has

Libssh Releases Update to Patch 9 New Security Vulnerabilities

Libssh Releases Update to Patch 9 New Security Vulnerabilities
March 19, 2019Wang Wei
Libssh2, a popular open source client-side C library implementing the SSHv2 protocol, has released the latest version of its software to patch a total of nine security vulnerabilities. The Libssh2 library is available for all major distributors of the Linux operating systems, including Ubuntu, Red Hat, Debian, and also comes bundled within some distributions and software as a default library. According to an  advisory published Monday, all the below listed vulnerabilities that were patched with the release of libssh2 version 1.8.1 lead to memory corruption issues which could result in arbitrary code execution on a client system in certain circumstances. Here's the list of security vulnerabilities patched in Libssh: 1. CVE-2019-3855: Possible integer overflow in transport read that could lead to an out-of-bounds write. A malicious server, or a remote attacker who compromises an SSH server, could send a specially crafted packet which could result in executing malicious

Unprotected Government Server Exposes Years of FBI Investigations

Unprotected Government Server Exposes Years of FBI Investigations
January 17, 2019Swati Khandelwal
A massive government data belonging to the Oklahoma Department of Securities (ODS) was left unsecured on a storage server for at least a week, exposing a whopping 3 terabytes of data containing millions of sensitive files. The unsecured storage server, discovered by Greg Pollock , a researcher with cybersecurity firm UpGuard, also contained decades worth of confidential case files from the Oklahoma Securities Commission and many sensitive FBI investigations—all wide open and accessible to anyone without any password. Other severe files exposed included emails, social security numbers, names, and addresses of 10,000 brokers, credentials for remote access to ODS workstations, and communications meant for the Oklahoma Securities Commission, along with a list of identifiable information related to AIDS patients. While the researcher doesn't know exactly how long the server was open to the public, the Shodan search engine revealed that the server had been publicly open since at

Over 202 Million Chinese Job Seekers' Details Exposed On the Internet

Over 202 Million Chinese Job Seekers' Details Exposed On the Internet
January 10, 2019Wang Wei
Cybersecurity researcher has discovered online a massive database containing records of more than 202 million Chinese citizens that remained accessible to anyone on the Internet without authentication until last week. The unprotected 854.8 gigabytes of the database was stored in an instance of MongoDB, a NoSQL high performance and cross-platform document-oriented database, hosted by an American server hosting company. In total, the database contained 202,730,434 records about job candidates from China, including candidates' personal information such as their full name, date of birth, phone number, email address, marriage status, and driver's license information, along with their professional experience and job expectations. Bob Diachenko, director of cyber risk research at Hacken.io and bug bounty platform HackenProof, discovered the existence of database two weeks ago, which had been secured shortly after his notification on Twitter. However, it is worth noting that &

16-Year-Old Teen Hacked Apple Servers, Stole 90GB of Secure Files

16-Year-Old Teen Hacked Apple Servers, Stole 90GB of Secure Files
August 17, 2018Mohit Kumar
Well, there's something quite embarrassing for Apple fans. Though Apple servers are widely believed to be unhackable, a 16-year-old high school student proved that nothing is impossible. The teenager from Melbourne, Australia, managed to break into Apple servers and downloaded some 90GB of secure files, including extremely secure authorized keys used to grant login access to users, as well as access multiple user accounts. The teen told the authorities that he hacked Apple because he was a huge fan of the company and "dreamed of" working for the technology giant. What's more embarrassing? The teen, whose name is being withheld as he's still a minor, hacked the company's servers not once, but numerous times over the course of more than a year, and Apple's system administrators failed to stop their users' data from being stolen. When Apple finally noticed the intrusion, the company contacted the FBI, which took the help of the Australian Fede

Backdoor Found in Popular Server Management Software used by Hundreds of Companies

Backdoor Found in Popular Server Management Software used by Hundreds of Companies
August 16, 2017Swati Khandelwal
Cyber criminals are becoming more adept, innovative, and stealthy with each passing day. They are now adopting more clandestine techniques that come with limitless attack vectors and are harder to detect. Recently, cyber crooks managed to infiltrate the update mechanism for a popular server management software package and altered it to include an advanced backdoor, which lasts for at least 17 days until researchers discovered it. Dubbed ShadowPad , the secret backdoor gave attackers complete control over networks hidden behind legit cryptographically signed software sold by NetSarang —used by hundreds of banks, media firms, energy companies, and pharmaceutical firms, telecommunication providers, transportation and logistics and other industries—for 17 days starting last month. Important Note — If you are using any of the affected product (listed below), we highly recommend you stop using it until you update them. Hacker Injected Backdoor Through Software Update Mechanism
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