Debian: DSA-4581-1 Critical: Git Security Fixes for Multiple Threats

CVE-2019-1348

It was reported that the --export-marks option of git fast-import is
exposed also via the in-stream command feature export-marks=...,
allowing to overwrite arbitrary paths.

CVE-2019-1387

It was discovered that submodule names are not validated strictly
enough, allowing very targeted attacks via remote code execution
when performing recursive clones.

CVE-2019-19604

Joern Schneeweisz reported a vulnerability, where a recursive clone
followed by a submodule update could execute code contained within
the repository without the user explicitly having asked for that. It
is now disallowed for `.gitmodules` to have entries that set
`submodule..update=!command`.

In addition this update addresses a number of security issues which are
only an issue if git is operating on an NTFS filesystem (CVE-2019-1349,
CVE-2019-1352 and CVE-2019-1353).

For the oldstable distribution (stretch), these problems have been fixed
in version 1:2.11.0-3+deb9u5.

For the stable ...