Microsoft today posted an advisory to inform users of active attacks targeting unpatched flaws in Adobe Type Manager Library. The vulnerabilities affect all supported versions of Windows.
Two remote code execution vulnerabilities exist in Microsoft Windows when the Adobe Type Manager Library improperly handles a specially crafted multimaster font called Adobe Type 1 PostScript format, Microsoft explains in the advisory. The company is aware of "limited targeted attacks" that could leverage the unpatched vulnerabilities, which the company ranked as Critical.
There are several ways an attacker could successfully take advantage of these flaws. For example, they could convince a user to open a specially crafted document or view it in the Windows Preview pane. Opening or viewing the file would let the attacker remotely run malicious code on the target machine. While the Windows Preview pane could be an attack vector, Microsoft says Outlook Preview Pane is not an attack vector for these vulnerabilities.
"For systems running supported versions of Windows 10, a successful attack could only result in code execution within an AppContainer sandbox context with limited privileges and capabilities," officials explain of the potential effects on supported Windows 10 machines.
Microsoft is working on a fix for the vulnerabilities. The company usually releases patches on the second Tuesday of each month, a schedule it says allows for both quality assurance and IT planning. It has been known to issue out-of-band patches for urgent vulnerabilities as needed. Microsoft did not provide details on when a patch for these ..
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