Fix for CVE-2022-42919

00391-don-t-use-linux-abstract-sockets-for-multiprocessing.patch

@@ -0,0 +1,64 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: "Miss Islington (bot)"
+ <31488909+miss-islington@users.noreply.github.com>
+Date: Fri, 28 Oct 2022 03:08:30 -0700
+Subject: [PATCH] 00391: Don't use Linux abstract sockets for multiprocessing
+
+Linux abstract sockets are insecure as they lack any form of filesystem
+permissions so their use allows anyone on the system to inject code into
+the process.
+
+This removes the default preference for abstract sockets in
+multiprocessing introduced in Python 3.9+ via
+https://github.com/python/cpython/pull/18866 while fixing
+https://github.com/python/cpython/issues/84031.
+
+Explicit use of an abstract socket by a user now generates a
+RuntimeWarning.  If we choose to keep this warning, it should be
+backported to the 3.7 and 3.8 branches.
+(cherry picked from commit 49f61068f49747164988ffc5a442d2a63874fc17)
+
+Co-authored-by: Gregory P. Smith <greg@krypto.org>
+---
+ Lib/multiprocessing/connection.py                 |  5 -----
+ .../2022-09-07-10-42-00.gh-issue-97514.Yggdsl.rst | 15 +++++++++++++++
+ 2 files changed, 15 insertions(+), 5 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/Security/2022-09-07-10-42-00.gh-issue-97514.Yggdsl.rst
+
+diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
+index 510e4b5aba..8e2facf92a 100644
+--- a/Lib/multiprocessing/connection.py
++++ b/Lib/multiprocessing/connection.py
+@@ -73,11 +73,6 @@ def arbitrary_address(family):
+     if family == 'AF_INET':
+         return ('localhost', 0)
+     elif family == 'AF_UNIX':
+-        # Prefer abstract sockets if possible to avoid problems with the address
+-        # size.  When coding portable applications, some implementations have
+-        # sun_path as short as 92 bytes in the sockaddr_un struct.
+-        if util.abstract_sockets_supported:
+-            return f"\0listener-{os.getpid()}-{next(_mmap_counter)}"
+         return tempfile.mktemp(prefix='listener-', dir=util.get_temp_dir())
+     elif family == 'AF_PIPE':
+         return tempfile.mktemp(prefix=r'\\.\pipe\pyc-%d-%d-' %
+diff --git a/Misc/NEWS.d/next/Security/2022-09-07-10-42-00.gh-issue-97514.Yggdsl.rst b/Misc/NEWS.d/next/Security/2022-09-07-10-42-00.gh-issue-97514.Yggdsl.rst
+new file mode 100644
+index 0000000000..02d95b5705
+--- /dev/null
++++ b/Misc/NEWS.d/next/Security/2022-09-07-10-42-00.gh-issue-97514.Yggdsl.rst
+@@ -0,0 +1,15 @@
++On Linux the :mod:`multiprocessing` module returns to using filesystem backed
++unix domain sockets for communication with the *forkserver* process instead of
++the Linux abstract socket namespace.  Only code that chooses to use the
++:ref:`"forkserver" start method <multiprocessing-start-methods>` is affected.
++
++Abstract sockets have no permissions and could allow any user on the system in
++the same `network namespace
++<https://man7.org/linux/man-pages/man7/network_namespaces.7.html>`_ (often the
++whole system) to inject code into the multiprocessing *forkserver* process.
++This was a potential privilege escalation. Filesystem based socket permissions
++restrict this to the *forkserver* process user as was the default in Python 3.8
++and earlier.
++
++This prevents Linux `CVE-2022-42919
++<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42919>`_.

python3.9.spec

@@ -17,7 +17,7 @@ URL: https://www.python.org/
 #global prerel ...
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: Python
 
 
@@ -397,6 +397,23 @@ Patch371: 00371-revert-bpo-1596321-fix-threading-_shutdown-for-the-main-thread-g
 # Tracker bug: https://bugzilla.redhat.com/show_bug.cgi?id=2075390
 Patch382: 00382-cve-2015-20107.patch
 
+# 00391 # e6d12d8fca6afad3a56dc076c220f213b723a28e
+# Don't use Linux abstract sockets for multiprocessing
+#
+# Linux abstract sockets are insecure as they lack any form of filesystem
+# permissions so their use allows anyone on the system to inject code into
+# the process.
+#
+# This removes the default preference for abstract sockets in
+# multiprocessing introduced in Python 3.9+ via
+# https://github.com/python/cpython/pull/18866 while fixing
+# https://github.com/python/cpython/issues/84031.
+#
+# Explicit use of an abstract socket by a user now generates a
+# RuntimeWarning.  If we choose to keep this warning, it should be
+# backported to the 3.7 and 3.8 branches.
+Patch391: 00391-don-t-use-linux-abstract-sockets-for-multiprocessing.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -1812,6 +1829,10 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Wed Nov 09 2022 Lumír Balhar <lbalhar@redhat.com> - 3.9.15-2
+- Fix for CVE-2022-42919
+Resolves: rhbz#2138711
+
 * Wed Oct 12 2022 Miro Hrončok <mhroncok@redhat.com> - 3.9.15-1
 - Update to 3.9.15