CVE-2022-23521

Git is distributed revision control system. gitattributes are a mechanism
to allow defining attributes for paths. These attributes can be defined by
adding a .gitattributes file to the repository, which contains a set of
file patterns and the attributes that should be set for paths matching this
pattern. When parsing gitattributes, multiple integer overflows can occur
when there is a huge number of path patterns, a huge number of attributes
for a single pattern, or when the declared attribute names are huge. These
overflows can be triggered via a crafted .gitattributes file that may be
part of the commit history. Git silently splits lines longer than 2KB when
parsing gitattributes from a file, but not when parsing them from the
index. Consequentially, the failure mode depends on whether the file exists
in the working tree, the index or both. This integer overflow can result in
arbitrary heap reads and writes, which may result in remote code execution.
The problem has been patched in the versions published on 2023-01-17, going
back to v2.30.7. Users are advised to upgrade. There are no known
workarounds for this issue.