Paul Morigi/Getty Images
Yahoo CEO Marissa Mayer
Two internet security firms have warned that hundreds of thousands of Yahoo.com visitors may have encountered malware from Yahoo’s advertising servers, The Washington Post reports.
In a blog post on Friday, Netherlands-based Fox-IT wrote that it “detected and investigated the infection of clients after they visited yahoo.com.” Some advertisements displayed to Yahoo visitors — which are served from ads.yahoo.com – were malicious iframes, hosted on a number of domains, the firm reported.
From The Washington Post:
Ashkan Soltani, a security researcher and Washington Post contributor, alerted me to the issue. Often, he says, such attacks are “the result of hacking an existing ad network. But there’s another possibility, he says. The culprits may have simply submitted the malicious software as ordinary ads, sneaking past Yahoo’s system for filtering out malicious submissions.