Specially crafted DNS packets can compromise the popular Squid web proxy/cache in such a way that it briefly fails to respond. The problem is caused by insufficiently checked DNS responses which Squid initially places in a queue. By sending packets that only contain a header, a queue overflow can be triggered which can apparently be exploited for Denial-of-Service (DoS) attacks.. The flaw can be exploited both from internal clients and from external DNS servers. The problem has been known since the most recent Chaos Communication Congress (26c3), where Fabian Yamaguchi described the details of this, as well as further flaws in other applications, in his presentation entitled "cat /proc/sys/net/ipv4/fuckups"PDF. Versions 2.x, 3.0 up to and including 3.0.STABLE21, and Squid 3.1 up to and including 3.1.0.15 are affected. In versions 3.0.STABLE22 and 3.1.0.16 of Squid, the flaw has been fixed. A patch is also available. The link for this article located at H Security is no longer available. . A vulnerability in the Squid proxy poses risks for DoS attacks through specially designed DNS queries; timely updates are essential for safeguarding.. Squid Proxy, DoS Risk, DNS Exploits. . LinuxSecurity.com Team
A very serious flaw in the Internet's DNS servers may have been ripe for a significant exploit, though a familiar security researcher might have sounded the alarm just in time. Now, Microsoft and Linux vendors are responding urgently. In what appears to be a coordinated effort to fix a well known, though still potentially critical vulnerability to the Domain Name System (DNS) protocol, patches are being deployed today for both Windows and Linux, by both Microsoft and Debian, respectively. These patches would enable a long suggested protocol for validating the source of DNS requests. This is definitely an patch that every DNS server should do updates for. Do you think we are going to see DNS servers being attacked in the coming days? . . An alarming vulnerability in the global DNS infrastructure has been identified, prompting immediate updates to secure systems.. DNS Servers Fix, Debian Security Update, Network Security Patch, Critical Vulnerability, Exploit Mitigation. . Bill Locke
The theory is now a reality. Symantec reported Tuesday that drive-by pharming, in which a hacker changes the DNS settings on a customer. The link for this article located at Network World is no longer available. . The link for this article located at Network World is no longer available.. theory, reality, symantec, reported, tuesday, drive-by, pharming, which, hacker. . Brittany Day
Get the latest Linux and open source security news straight to your inbox.