After a relatively quiet few months, Microsoft Patch Tuesday is back in full force, covering three zero-day vulnerabilities that administrators should attend to as quickly as possible.
Microsoft issued eight security bulletins Tuesday, covering a total of 24 vulnerabilities found in Windows, Internet Explorer, Office and the .Net framework. Three of the bulletins are marked as critical, which means administrators should test and apply these patches immediately. A single bulletin can cover multiple vulnerabilities within one technology.
Three of these vulnerabilities are already being exploited by malicious attackers, hence they are being called zero-day vulnerabilities. This is the first time in recent history -- and perhaps ever -- that Microsoft has fixed three zero-day vulnerabilities in a single round of patches, which Microsoft typically issues on the second Tuesday of each month.
"Sandworm" is the most notorious of the three and is a vulnerability in Microsoft Windows that has already been used in attacks on NATO and a number of European government agencies, telecommunication firms and energy companies, according to cyberthreat intelligence firm iSight. Microsoft Bulletin MS14-060 fixes this bug.
"This is an urgent one to fix," said Wolfgang Kandek, chief technology officer for IT security firm Qualys.
Microsoft marked MS14-060 as important rather than critical because for the attack to work, it would require a user to click on a file. Qualys ranks this vulnerability as more severe in that it is pretty easy to trick a single person into clicking on a file, such as a PowerPoint presentation, which would be all that would be required for an attacker to gain access to an internal network with a well-crafted script, Kandek said.
Sandworm is a good reminder for administrators to make sure that they set the user permissions correctly on desktop and laptop computers, meaning not to give an end user full administrative privileges on the machine, Kandek said.
The second zero-day flaw addresses a problem in Internet Explorer and the fix is found in MS14-056. This vulnerability "could allow an attacker to break out of the sandboxing capabilities in Internet Explorer," said Amol Sarwate, director of vulnerability research at Qualys.
The third zero-day, addressed in MS14-058, also comes from a flaw within Windows, namely from the way the operating system kernel drivers handle TrueType fonts. An attacker could embed some malicious code within a TrueType font. When a user visits a site with these ill fonts, Windows will download the font package and automatically execute the code buried within.
Beyond Microsoft's patches, administrators will also have a busy week with patches from Adobe and Oracle, Kandek said.
On Tuesday, Adobe released a set of patches for its Flash multimedia player. Oracle is also releasing a wide range of patches for its enterprise software. In particular, administrators should take a look at the Java patches, Kandek advised.