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This article is the first in an occasional series on DKIM/ADSP edge cases that may not be generally recognized or understood. Many people advocate DKIM/ADSP adoption without fully recognizing potential implementation and operational issues. The fact is that the email messaging environment is fraught with opportunities for poor outcomes because of common practices that need to be considered or poorly understood implementations that are not considered... more
In part 1, we explained that the DKIM "d=" value identifies the domain name which signed the message, which may be a different domain name from the author of the message. Tying the signing and author domains together will require an additional standard: Author Domain Signing Practices (ADSP). In IETF parlance, the "author domain" is the domain name in the From: header, so ADSP is a way for the author domain to publish a statement specifying whether any other domain name should ever sign a message purporting to be From: that author domain... more
DomainKeys Identified Mail (DKIM) is the leading email authentication technology, supported by major ISPs including Google, AOL, and Yahoo! (who invented its predecessor), popular mail server software like Sendmail, and many of the best minds in email technology. But if you peruse the archives of the IETF DKIM mailing list, or start up a conversation at MAAWG, it might appear that there's still a lot of disagreement about what a DKIM signature actually means. more
I've been privately talking about the theoretical dangers of HTTPS hacking with the developers of a major web browser since 2006 and earlier last month, I published my warnings about HTTPS web hacking along with a proposed solution. A week later, Google partially implemented some of my recommendations in an early Alpha version of their Chrome 2.0 browser... This week at the Black Hat security conference in Washington DC, Moxie Marlinspike released a tool called SSL Strip... more
Security expert and malware analyst, Lenny Zeltser has examined a creative malware distribution method in the real world where fliers placed on windshield of cars scare drivers into visiting a malicious website. Zeltser writes: "Several days ago, yellow fliers were placed on the cards in Grand Forks, ND. They stated: 'PARKING VIOLATION This vehicle is in violation of standard parking regulations. To view pictures with information about your parking preferences, go to website-redacted' ... If you went to the website, you'd see several photos of cars on parking lots in that specific town..." more
This very interesting document was released by ICANN's Generic Names Supporting Organization (GNSO) for public comment yesterday. And it asks some fundamental questions while at the same time pointing to sources such as the Honeynet Alliance's reports on fast flux. more
As some of us are continuing to learn this week the Monster.com service has again been successfully hacked. According to a security bulletin posted on Monster.com on January 23rd, 2009, the intruder gained access to the user database, while no resumes were apparently compromised... As a user of Monster.com what I find incredibly upsetting about this situation is that I had to find out about this through a security blog. more
ICANN has been wrangling about WHOIS privacy for years. Last week, yet another WHOIS working group ended without making any progress. What's the problem? Actually, there are two: one is that WHOIS privacy is not necessarily all it's cracked up to be, and the other is that so far, nothing in the debate has given any of the parties any incentive to come to agreement. The current ICANN rules for WHOIS say, approximately, that each time you register a domain in a gTLD (the domains that ICANN manages), you are supposed to provide contact information... WHOIS data is public, and despite unenforceable rules to the contrary, it is routinely scraped... more
As I blogged about several months ago, as did numerous other anti-spam bloggers, David Ritz was sued by Jeffrey Reynolds and a judge in North Dakota agreed with Reynolds. At the heart of the case was that Ritz engaged in anti-spam activities using techniques known only to a small subset of advanced computer users, and used these techniques maliciously against Reynolds... Back in the olden days of spam fighting, some anti-spammers used to use malicious techniques against spammers in order to shut them down... more
As recently reported, spam volumes indicate spam has nearly jumped back up to its pre-McColo shutdown levels. However, Symantec's The State of Spam report has also observed that in recent days spammers are increasingly piggybacking on legitimate newsletters and using the reputation of major social networking sites to try and deliver spam messages into recipients' inboxes... In its special URL investigation the report also indicates that on average approximately 90 percent of all spam messages today contain some kind of a URL. Additionally, analysis of data from past recent days, according to Symantec, have shown that 68% of all URLs in spam messages had a '.com' Top-Level Domain (TLD), 18% had a China's '.cn' ccTLD and 5% had a '.net'. more
Whatever your personal perspective of the rights and wrongs of the current Arab-Israeli war in Gaza, there is a second front being fought on the Internet, says Jart Armin of HostExploit.com in a blog post today. "This form of warfare is a battle of words and often vivid imagery engaged by hackers from either side of the divide." more
The recent research highlighting the alarming practice of Secure Socket Layer (SSL) Certificate Authority (CA) vendors using the MD5 hashing algorithm (which was known to be broken since 2005) has shown a major crack in the foundation of the Web. While the latest research has shown that fake SSL certificates with MD5 hashes can be forged to perfection when the CA (such as VeriSign's RapidSSL) uses predictable certificate fields, the bigger problem is that the web has fundamentally botched secure authentication. more
Well, it's a yearly tradition in the western hemisphere that at the end of the year, we compose a top 10 list of the 10 most
Always good for information on the spam economy, Brian Krebs of the Washington Post has just published a truly fascinating article: Researchers Hijack Storm Worm to Track Profits. Bottom line: a one-in-twelve-million conversion rate of spam to sales seems to be enough to keep the spam economy going. The article covers a project by researchers at UC San Diego and UC Berkeley, who managed to infiltrate the Storm Worm bot network and take over a small portion of it. more
Eugene Kaspersky, co-founder of Internet security software Kaspersky Lab, was recently interviewed PC World where he talked about his views regarding cybersecurity and the evolution of malware. In response to fixing the problems with malware on the Internet, Kapersky says: "The Internet was never designed with security in mind. If I was God, and wanted to fix the Internet, I would start by ensuring that every user has a sort of Internet passport: basically, a means of verifying identity, just like in the real world, with driver's licenses and passports and so on. The second problem is one of jurisdiction. The Internet has no borders, and neither do the criminals who operate on the Internet. However, law enforcement agencies have jurisdictional limits, and are unable to conduct investigations across the globe. ... There is no such thing as anonymity on the Internet, for the average user." more
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