nixCraft » Security Alert

Slowloris DoS Tool: It Can Bring Down Apache 1.x/2.x

nixCraft — Fri, 19 Jun 2009 14:50:39 +0000

Apache Security Update - a flaw In Apache can be used to carry out DoS. Slowloris is a new Apache DoS tool which can use slow Internet links to bring down Apache servers, rather than flooding networks. Most D/DoS tool requires faster net connections but this tool works with minimal bandwidth. This tool can lead to a DoS attack on Apache 1.x, 2.x, dhttpd, GoAhead WebServer, and Squid, while MS IIS6.0, IIS7.0, and lighttpd are confirmed not vulnerable to this attack.

Important: Openssl Security Update [CVE-2008-5077]

nixCraft — Thu, 08 Jan 2009 21:58:45 +0000

Linux / BSD and UNIX like operating systems includes software from the OpenSSL Project. The OpenSSL is commercial-grade, industry-strength, full-featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as general purpose cryptography library.

The Google security team discovered a flaw in the way OpenSSL checked the verification of certificates. An attacker in control of a malicious server, or able to effect a "man in the middle" attack, could present a malformed SSL/TLS signature from a certificate chain to a vulnerable client and bypass validation.

This update has been rated as having important security impact on FreeBSD, all version of Ubuntu / Debian, Red Hat (RHEL), CentOS, Fedora and other open source operating system that depends upon OpenSSL.

Debian GNU/Linux 4.0 Update 6 Released

nixCraft — Thu, 18 Dec 2008 14:07:25 +0000

Didn't take long to release new updated version.
The Debian project is pleased to announce the sixth update of its stable distribution Debian GNU/Linux 4.0 (codename "etch"). This update mainly adds corrections for security problems to the stable release, along with a few adjustment to serious problems. This update has been rated as having important security impact. You are advised to upgrade system ASAP.

Mozilla Patches 8 Security Flaws

nixCraft — Wed, 17 Dec 2008 18:02:43 +0000

Mozilla has released software updates to fix at least 8 security vulnerabilities (3 critical bugs) in its Firefox software for the Windows, Linux, Mac and other platforms. You can now download Firefox version 3.0.5. This update has been rated as having important security impact.

Security Update: Debian Linux Kernel Local / Remote Vulnerabilities

nixCraft — Thu, 04 Dec 2008 18:54:14 +0000

Debian project today released a pair of security updates to plug at least ten security holes in its core called Linux kernel. Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. This update has been rated as having important security impact.

Debian PHP 5 Security Issues

nixCraft — Thu, 27 Nov 2008 04:49:16 +0000

Debian 5 php5 package has serious security issues as follows: To prevent Denial of Service attacks by exhausting the number of available temporary file names, the max_file_uploads option introduced in PHP 5.3.1 has been backported.

FreeBSD Kernel Critical Update: arc4random predictable sequence vulnerability

nixCraft — Tue, 25 Nov 2008 12:49:44 +0000

FreeBSD today released a core (kernel) patched to plug "arc4random predictable sequence vulnerability" security hole in its operating systems version 6.x and 7.x stable release. When the arc4random random number generator is initialized, there may be inadequate entropy to meet the needs of kernel systems which rely on arc4random; and it may take up to 5 minutes before arc4random is reseeded with secure entropy from the Yarrow random number generator. All security-related kernel subsystems that rely on a quality random number generator are subject to a wide range of possible attacks. This update has been rated as having important security impact.

Security Alert: Streamripper buffer overflow bug

nixCraft — Sat, 08 Nov 2008 19:09:39 +0000

Multiple buffer overflows involving HTTP header and playlist parsing have been discovered in streamripper (CVE-2007-4337, CVE-2008-4829).

Red Hat Enterprise Linux 5 IMPORTANT Security Update [ 4-Nov-2008 ]

nixCraft — Tue, 04 Nov 2008 21:35:30 +0000

Red Hat today released kernel updates to fix at least 15 security flaws in its core called Linux kernel. RHEL users can grab the latest updates from RHN website or by simply running yum update command. This update has been rated as having important security impact.

Debian Upgrade: GNU/Linux 4.0 Update 5 Available

nixCraft — Fri, 24 Oct 2008 11:05:05 +0000

The industry strength community driven enterprise grade Debian GNU/Linux version 4.0 stable update 5 has been released and available for immediate downloaded as well as updates via apt-get package manager. This update mainly adds corrections for security problems to the stable release, along with a few adjustment to serious problems. All users are advised to upgrade system.

Critical Red Hat Enterprise Linux Kernel Update

nixCraft — Wed, 01 Oct 2008 08:44:57 +0000

Red Hat issued an update version of Linux operating system core called kernel that plugs various security holes for RHEL 5.x. This update has been rated as having important security impact. All users are advised to upgrade kernel package.

Security Alert: How To Stop Firefox Clickjacking Exploit Attack

nixCraft — Fri, 26 Sep 2008 09:03:55 +0000

Really scary exploit attack in wild, which affects all browsers under any desktop operating systems including MS IE, Linux, Apple safari, Opera, Firefox and Adobe flash. Any website that uses CSS and IFRAME (used to serve ads) can be used to attack on end users as attacker is able to take control of the links that your browser visits. In this article I will share few tips to stop this deadly attack until final patch is released by vendors.

Security Alert: Debian OpenSSH packages Fix Denial of Service

nixCraft — Tue, 16 Sep 2008 21:09:28 +0000

Debian Linux project released the Openssh security updates for computers powered by its Debian Linux operating systems. It has been discovered that the signal handler implementing the login timeout in Debian's version of the OpenSSH server uses functions which are not async-signal-safe, leading to a denial of service vulnerability.

Critical Red hat / Fedora Linux Openssh Security Update

nixCraft — Fri, 22 Aug 2008 16:08:38 +0000

Last week one or more of Red Hat's servers got cracked. Now, it has been revealed that both Fedora and Red Hat servers have been compromised. As a result Fedora is changing their package signing key. The intruder was able to sign a small number of OpenSSH packages relating only to Red Hat Enterprise Linux 4 (i386 and x86_64 architectures only) and Red Hat Enterprise Linux 5 (x86_64 architecture only). This update has been rated as having critical security impact.

CentOS / Red Hat Enterprise Linux 5.2 Poor NFS Performance and Solution

nixCraft — Fri, 22 Aug 2008 09:41:58 +0000

A few days ago I noticed that NFS performance between a web server node and NFS server went down by 50%. NFS was optimized and the only thing was updated Red Hat kernel v5.2. I also noticed same trend on CentOS 5.2 64 bit edition.

Postfix Mail Server Security Update [moderate security impact]

nixCraft — Mon, 18 Aug 2008 22:10:28 +0000

Postfix MTA updated to fix security vulnerabilities such as incorrectly checks the ownership of a mailbox. In some configurations, this allows for appending data to arbitrary files as root. This update has been rated as having moderate security impact.

dnsmasq Dns Cache Software Security Update To Fix DNS Spoofing Attacks

nixCraft — Tue, 12 Aug 2008 06:55:27 +0000

Red Hat has shipped a new version of its dnsmasq caching software to plug source UDP port bug. This could have made DNS spoofing attacks (CVE-2008-1447) easier. Dnsmasq is lightweight ultra fast dns cache server forwarder and DHCP server. It is designed to provide DNS and, optionally, DHCP, to a small network.

Download Of The Day: Firefox 3.0.1 (Critical Security Update)

nixCraft — Fri, 18 Jul 2008 10:36:05 +0000

Firefox 3.0.1 has been released and available for download. This update has been rated as having critical security impact by the Mozilla. Use the following instructions to upgrade Firefox.

Ubuntu Linux Critical Kernel Vulnerabilities Fix Available

nixCraft — Wed, 16 Jul 2008 07:58:42 +0000

Canonical Ltd has issued updates for its Kernel package to plug multiple security holes. A security issue affects all Ubuntu Linux versions.

Debian Linux Security Update: Lighttpd DoS and Gaim Package Remote Security Issues

nixCraft — Tue, 15 Jul 2008 18:19:58 +0000

Debian Linux project released today bug fixes for lighttpd and gaim package that allows remote attacks and DoS attacks.