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Adobe - http://www.adobe.com/support/security/
Security bulletins and technical briefs that provide information to customers.
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Microsoft Security - http://www.microsoft.com/security/
Microsoft-product-related security headlines and bulletins.
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FreeBSD - http://www.freebsd.org/security/
Advisories, mailing lists, tips, tricks, guidelines, links.
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Debian: Security Information - http://www.debian.org/security/
Details of current and archive security advisories. Includes mailing list and a security FAQ.
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Microsoft - http://www.microsoft.com/downloads/en/
Download security updates, service packs, and anti-spyware tools for Windows.
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Red Hat Linux Errata - http://www.redhat.com/security/
Security advisories and updates (patches) for all supported versions.
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Apache Web Server - http://www.apacheweek.com/security/
Advisories and patches.
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SGI: IRIX - http://www.sgi.com/support/security/
Security advisories and patch downloads. Includes mailing list.
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OpenBSD Release Errata - http://www.openbsd.org/errata.html
Advisories and patches.
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Cisco - http://www.cisco.com/en/US/products/products_security_advisories_listing.html
Patches and advisories for Cisco products
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OpenBSD Security - http://www.openbsd.org/security.html
Advisories and information.
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HP: Tru64 Unix - http://h30097.www3.hp.com/unix/security-download.html
Security advisories and associated patches.
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SCO - http://www.sco.com/support/security/
Security information for Caldera OpenLinux, OpenServer, OpenUnix, and UnixWare.
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NetBSD - http://www.netbsd.org/Security/index.html
Advisories, patches, links.
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Oracle - http://otn.oracle.com/deploy/security/alerts.htm
Patches and other security information.
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Sun Microsystems - http://sunsolve.sun.com/pub-cgi/show.pl?target=patches/patch-access
Security and recommended patches for Solaris: patch clusters and individual patches.
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FreeBSD Patches FTP Site - ftp://ftp.freebsd.org/pub/FreeBSD/CERT/
Security advisories and patches.
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HP: IT Resource Center - http://www2.itrc.hp.com/
Americas/Asia-Pacific site offering online support. Includes knowledge base, patches, drivers and security mailing lists.
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Compaq - http://www1.itrc.hp.com/service/home/compaqMain.do
Patches and advisories for most Compaq products.
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AIX - ftp://aix.boulder.ibm.com/aix/fixes/
Security and other patches for AIX. Note that this is an FTP site.
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SCO Unix System Security Enhancement Area - ftp://ftp.sco.com/pub/security/sse/
Advisories and patches. Note this is an FTP site.
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Citrix - http://support.citrix.com/latestsecurityall!execute.jspa
Security bulletins and hotfixes for Citrix products
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AIX Patches - Fixdist - ftp://aix.boulder.ibm.com/aix/tools/fixdist/
You need the "fixdist" program to install AIX patches.
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SuSE Linux - http://www.suse.de/en/support/download/updates/
Patches directories for all supported versions, plus a security announcements list (English).
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KDE - ftp://ftp.kde.org/pub/kde/security_patches/
Only if you've built KDE yourself; otherwise probably available from your Linux distribution vendor's patches directory. Note this is an FTP site.
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HP-UX Patch Additional Information - ftp://us-ffs.external.hp.com/export/patches/
Patch Security Matrix, list of obsolete patches, patch checksums.
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