The security bulletin links to a generic description of the flaw which states: It’s unclear how the weakness was introduced to Adobe Acrobat. The vulnerability class also goes by the names DLL preloading, insecure library loading and dependency confusion. One of the more interesting critical bugs patched is a type of vulnerability called an “uncontrolled search path element” flaw (CVE-2021-28636).
Two of the most serious Acrobat vulnerabilities are use-after-free flaws ( CVE-2021-28641, CVE-2021-28639) that, in a worst case scenario, allow an adversary to execute code arbitrarily on targeted systems or just create application crashes. In all, Adobe patched 20 Acrobat bugs, with nine rated important. Adobe also patched Acrobat DC, Acrobat DC Reader, Acrobat Reader 2017 and Acrobat 2017. The free Acrobat Reader 2020 and PDF-creation and editing software Acrobat 2020 were among the list of those programs with critical bugs patched. Adobe added however that it was not aware of any abuse of the bugs in the wild. In a Tuesday security bulletin, which included patches for all flaws, the company reported that Windows and macOS versions of Acrobat were equally vulnerable.
#FREE ADOBE ACROBAT READER UPDATE PDF#
Eleven critical bugs in Adobe’s popular and free PDF reader, Acrobat, open both Window and macOS users to attacks ranging from an adversary arbitrarily executing commands on a targeted system to data leakage tied to system-read and memory flaws.
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