Yesterday Microsoft released an emergency security update for all of the supported Windows version (this means Windows 7, Windows 8/8.1, Windows RT and apparently even the unreleased Windows 10). The patch is supposed to fix an exploit that would allow hackers to access another computer easily. According to the company the flaw lies in the way the Windows Adobe Type Manager Library improperly handles specially crafted OpenType fonts.
“An attacker who successfully exploited this vulnerability could take complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights,” Microsoft says in their security bulletin. “There are multiple ways an attacker could exploit this vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage that contains embedded OpenType fonts. The update addresses the vulnerability by correcting how the Windows Adobe Type Manager Library handles OpenType fonts.“
Microsoft also says that while they had information that indicates that the issue was public there is no evidence that the vulnerability was used in any actual attack on customers.
The vulnerability itself was apparently found after going through loads of data from the Hacking Team email breach.
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Hacker Mateusz Jurczyk from Google’s Project Zero disclosed 15 remote execution vulnerabilities, most of them for Windows and the Adobe Type Manager Font Driver. He presented his findings at the Recon security conference and aptly named his research “One font vulnerability to rule them all: A story of cross-software ownage, shared codebases and advanced exploitation”.
According to his blog the most serious and interesting security issue he discovered so far was a really reliable BLEND instruction exploit. Jurczyk writes that “the extremely powerful primitive provided by the vulnerability, together with the fact that it affected all supported versions of both Adobe Reader and Microsoft Windows (32-bit) – thus making it possible to create an exploit chain leading to a full system compromise with just a single bug – makes it one of the most interesting security issues I have discovered so far.”
He also shared two videos in which he shows how he successfully exploits the Adobe Reader 11.0.10 using the BLEND vulnerability (CVE-2015-3052), accompanied by sandbox escapes via ATMFD.DLL in the Windows Kernel as well as a “Registry Object” vulnerability on x64 builds (CVE-2015-0090).
Jurczyk reported all of his discoveres to Microsoft and Adobe which fixed the bugs in security bulletins MS15-021 (March), APSB15-10(May) and MS15-044 (May).
The post Time to Patch: Loads of Security Issues in Adobe Reader and Microsoft Windows appeared first on Avira Blog.