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Google announced »a simple, unified schema for describing vulnerabilities precisely. «
The author explains an interesting information leakage bug in TXT files for TextEdit.
»The goal of OSV is to provide precise data on where a vulnerability was introduced and where it got fixed, thereby helping consumers of open source software accurately identify if they are impacted and then make security fixes as quickly as possible.«
The basic premise of this attack is that FollowSymlinkInScope suffers
from a fairly fundamental TOCTOU attack. The purpose of
FollowSymlinkInScope is to take a given path and safely resolve it as
though the process was inside the container. After the full path has
been resolved, the resolved path is passed around a bit and then
operated on a bit later (in the case of 'docker cp' it is opened when
creating the archive that is streamed to the client). If an attacker can
add a symlink component to the path after the resolution but before
it is operated on, then you could end up resolving the symlink path
component on the host as root. In the case of 'docker cp' this gives you
read and write access to any path on the host.
The vulnerability allows a malicious container to (with minimal user
interaction) overwrite the host runc binary and thus gain root-level
code execution on the host.