Web server that use threaded processes such as Apache and others can be targeted using interesting HTTP DoS tool that has been released in wild. Tool can eat up all resources while it holds the connection open to server and keep sending incomplete HTTP requests. End result Apache run out of memory and comes under DoS attack.
[continue reading…]
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.
[continue reading…]
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.
[continue reading…]
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.
[continue reading…]
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.
[continue reading…]
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.
[continue reading…]
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.
arc4random(9) is a generic-purpose random number generator based on the key stream generator of the RC4 cipher. It is expected to be cryptographically strong, and used throughout the FreeBSD kernel for a variety of purposes, some of which rely on its cryptographic strength. arc4random(9) is periodically reseeded with entropy from the FreeBSD kernel’s Yarrow random number generator, which gathers entropy from a variety of sources including hardware interrupts. During the boot process, additional entropy is provided to the Yarrow random number generator from userland, helping to ensure that adequate entropy is present for cryptographic purposes.
All security-related kernel subsystems that rely on a quality random number generator are subject to a wide range of possible attacks for the 300 seconds after boot or until 64k of random data is consumed.
Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the RELENG_7_0, or RELENG_6_3 security branch using csup command. This will fix the problem.
The following patches have been verified to apply to FreeBSD 6.3 and 7.0 systems.
Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.
# cd /tmp
# fetch http://security.FreeBSD.org/patches/SA-08:11/arc4random.patch
# fetch http://security.FreeBSD.org/patches/SA-08:11/arc4random.patch.asc
Verify patch, enter:
# gpg --verify arc4random.patch.asc arc4random.patch
To apply the patch, enter:
# cd /usr/src
# patch /tmp/arc4random.patch
# cd /tmp
# fetch http://security.FreeBSD.org/patches/SA-08:11/arc4random6x.patch
# fetch http://security.FreeBSD.org/patches/SA-08:11/arc4random6x.patch.asc
Verify patch, enter:
# gpg --verify arc4random6x.patch.asc arc4random6x.patch
To apply the patch, enter:
# cd /usr/src
# patch /tmp/arc4random6x.patch
Now recompile your kernel:
# make kernel KERNCONF=GENERIC
# make installkernel KERNCONF=GENERIC
Replace GENERIC with your actual kernel name. Finally, reboot the system:
# reboot
Make sure everything is working fine, enter:
# uname -a
# tail -f /var/log/messages
# tail -f /path/to/other/log/files
# sockstat
Please see FreeBSD handbook for more information.
Multiple buffer overflows involving HTTP header and playlist parsing have been discovered in streamripper (CVE-2007-4337, CVE-2008-4829).
For the stable distribution (etch), these problems have been fixed in version 1.61.27-1+etch1.
For the unstable distribution (sid) and the testing distribution (lenny), these problems have been fixed in version 1.63.5-2.
Simply type the following two commands:
# apt-get update
# apt-get upgrade
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.
[continue reading…]
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.
Those who frequently install updates from security.debian.org won’t have to update many packages and most updates from security.debian.org are included in this update.
New CD and DVD images containing updated packages and the regular installation media accompanied with the package archive respectively will be available soon at the regular locations.
This stable update adds several binary updates for various architectures to packages whose version was not synchronised across all architectures. It also adds a few important corrections to the following packages:
Package Reason
apache2 Fix several vulnerabilities
apache2-mpm-itk Rebuild against apache2 and fix hanging processes on restart/shutdown
blosxom Fix XSS
dist Fix insecure temp file usage
fai-kernels Fix xfs corruption / Xen crash
feta Fix insecure temp file usage
git-core Support download of packs v2 through dumb transports
goby Rebuild against net6
irqbalance Fix segfault when /proc/interrupts contains an interrupt with a number of 256 or larger
jumpnbump Fix insecure handling of /tmp
libpam-pwdfile Use gcc instead of ld
linux-2.6 Fix xfs corruption / Xen crash
myspell Fix insecure temp file usage
net6 Fix object access after deallocation
obby Rebuild against new net6
postgresql-8.1 Upstream bugfix release 8.1.13
sobby Rebuild against new net6
trac Fix multiple vulnerabilities
tzdata Updates to several timezones and daylight saving times settings
user-mode-linux Fix xfs corruption / Xen crash
wdiff Fix race condition related to temporary files
This revision adds the following security updates to the stable release. The Security Team has already released an advisory for each of these updates:
Advisory ID Package Correction(s)
DSA 1597 mt-daapd Fix several vulnerabilities (fixes for regression)
DSA 1614 iceweasel Fix several vulnerabilities
DSA 1615 xulrunner Fix several vulnerabilities
DSA 1616 clamav Fix denial of service
DSA 1617 refpolicy Fix incompatible policy
DSA 1618 ruby1.9 Fix several vulnerabilities
DSA 1619 python-dns Fix DNS response spoofing
DSA 1620 python2.5 Fix several vulnerabilities
DSA 1621 icedove Fix several vulnerabilities
DSA 1622 newsx Fix arbitrary code execution
DSA 1623 dnsmasq Fix cache poisoning
DSA 1624 libxslt Fix arbitrary code execution
DSA 1625 cupsys Fix arbitrary code execution
DSA 1626 httrack Fix arbitrary code execution
DSA 1627 opensc Fix smart card vulnerability
DSA 1628 pdns Fix DNS response spoofing
DSA 1629 postfix Fix programming error
DSA 1630 linux-2.6 Fix several vulnerabilities
DSA 1630 fai-kernels Fix several vulnerabilities
DSA 1630 user-mode-linux Fix several vulnerabilities
DSA 1631 libxml2 Fix denial of service
DSA 1632 tiff Fix arbitrary code execution
DSA 1633 slash Fix multiple vulnerabilities
DSA 1634 wordnet Fix arbitrary code execution
DSA 1636 linux-2.6.24 Fix denial of service / information leak
DSA 1638 openssh Fix denial of service
DSA 1639 twiki Fix arbitrary code execution
DSA 1640 python-django Fix several vulnerabilities
DSA 1641 phpmyadmin Fix several vulnerabilities
DSA 1642 horde3 Fix cross site scripting
DSA 1643 feta Fix insecure temp file usage
DSA 1644 mplayer Fix integer overflows
DSA 1645 lighttpd Fix various problems
DSA 1646 squid Fix array bounds check
DSA 1647 php5 Fix several vulnerabilities
DSA 1648 mon Fix insecure temporary files
DSA 1649 iceweasel Fix several vulnerabilities
DSA 1650 openldap2.3 Fix denial of service
DSA 1651 ruby1.8 Fix several vulnerabilities
DSA 1652 ruby1.9 Fix several vulnerabilities
DSA 1653 linux-2.6 Fix several vulnerabilities
DSA 1653 fai-kernels Fix several vulnerabilities
DSA 1653 user-mode-linux Fix several vulnerabilities
DSA 1654 libxml2 Fix execution of arbitrary code
DSA 1655 linux-2.6.24 Fix several vulnerabilities
Login as root and type the following command:
# apt-get update
# apt-get upgrade
Sample output:
Get:1 http://http.us.debian.org stable Release.gpg [386B] Get:2 http://security.debian.org stable/updates Release.gpg [189B] Hit http://http.us.debian.org stable Release Hit http://security.debian.org stable/updates Release Ign http://http.us.debian.org stable/main Packages/DiffIndex Ign http://security.debian.org stable/updates/main Packages/DiffIndex Ign http://http.us.debian.org stable/non-free Packages/DiffIndex Ign http://http.us.debian.org stable/contrib Packages/DiffIndex Ign http://security.debian.org stable/updates/contrib Packages/DiffIndex Ign http://security.debian.org stable/updates/non-free Packages/DiffI ..... .. Setting up apache2-mpm-worker (2.2.3-4+etch6) ... Starting web server (apache2).... Setting up apache2 (2.2.3-4+etch6) ...
Reboot the system:
# uname -mrs
# reboot
Make sure everything is working fine:
# uname -a
# netstat -tulpn
# tail -f /var/log/messages
# dmesg | less
# tail -f /var/log/path/to/app.file
# iptables -L -n
