The pkgAcqMetaClearSig::Failed method in apt-pkg/acquire-item.cc in
Advanced Package Tool (APT) 0.8.11 through 0.8.15.10 and 0.8.16 before
0.8.16~exp13, when updating from repositories that use InRelease
files, allows man-in-the-middle attackers to install arbitrary
packages by preventing a user from downloading the new InRelease file,
which leaves the original InRelease file active and makes it more
difficult to detect that the Packages file is modified and unsigned.
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