ArchLinux: 202103-27: python2: multiple issues
Summary
- CVE-2019-20907 (denial of service)
In Lib/tarfile.py in Python through 3.8.3, an attacker is able to craft
a TAR archive leading to an infinite loop when opened by tarfile.open,
because _proc_pax lacks header validation.
- CVE-2020-8492 (denial of service)
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7
through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct
Regular Expression Denial of Service (ReDoS) attacks against a client
because of urllib.request.AbstractBasicAuthHandler catastrophic
backtracking.
- CVE-2020-26116 (url request injection)
http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x
before 3.7.9, and 3.8.x before 3.8.5 allows CRLF injection if the
attacker controls the HTTP request method, as demonstrated by inserting
CR and LF control characters in the first argument of
HTTPConnection.request.
- CVE-2020-27619 (arbitrary code execution)
In Python 3 through 3.9.0, the Lib/test/multibytecodec_support.py CJK
codec tests call eval() on content retrieved via HTTP.
- CVE-2021-3177 (arbitrary code execution)
Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in
_ctypes/callproc.c, which may lead to remote code execution in certain
Python applications that accept floating-point numbers as untrusted
input, as demonstrated by a 1e300 argument to c_double.from_param. This
occurs because sprintf is used unsafely.
- CVE-2021-23336 (url request injection)
The package python/cpython from 0 and before 3.6.13, from 3.7.0 and
before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2
are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and
urllib.parse.parse_qs by using a vector called parameter cloaking. When
the attacker can separate query parameters using a semicolon (;), they
can cause a difference in the interpretation of the request between the
proxy (running with default configuration) and the server. This can
result in malicious requests being cached as completely safe ones, as
the proxy would usually not see the semicolon as a separator, and
therefore would not include it in a cache key of an unkeyed parameter.
The package python-django contains a copy of urllib.parse.parse_qsl()
which was added to backport some security fixes. A further security fix
has been issued in versions 3.1.7, 3.0.13 and 2.2.19 such that
parse_qsl() no longer allows using ; as a query parameter separator by
default.
Resolution
Upgrade to 2.7.18-3.
# pacman -Syu "python2>=2.7.18-3"
The problems have been fixed upstream but no release is available yet.
References
https://bugs.archlinux.org/task/68063 https://bugs.python.org/issue39017 https://github.com/python/cpython/pull/21454 https://github.com/python/cpython/commit/5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4 https://bugs.python.org/issue39503 https://github.com/python/cpython/pull/18284 https://github.com/python/cpython/commit/0b297d4ff1c0e4480ad33acae793fbaf4bf015b4 https://python-security.readthedocs.io/vuln/http-header-injection-method.html https://bugs.python.org/issue39603 https://github.com/python/cpython/pull/18485 https://github.com/python/cpython/commit/8ca8a2e8fb068863c1138f07e3098478ef8be12e https://python-security.readthedocs.io/vuln/cjk-codec-download-eval.html https://bugs.python.org/issue41944 https://github.com/python/cpython/pull/22575 https://github.com/python/cpython/commit/b664a1df4ee71d3760ab937653b10997081b1794 https://python-security.readthedocs.io/vuln/ctypes-buffer-overflow-pycarg_repr.html https://bugs.python.org/issue42938 https://github.com/python/cpython/pull/24239 https://github.com/python/cpython/commit/c347cbe694743cee120457aa6626712f7799a932 https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/ https://bugs.python.org/issue42967 https://github.com/python/cpython/pull/24297 https://github.com/python/cpython/commit/c9f07813ab8e664d8c34413c4fc2d4f86c061a92 https://www.djangoproject.com/weblog/2021/feb/19/security-releases/ https://github.com/django/django/commit/8f6d431b08cbb418d9144b976e7b972546607851 https://security.archlinux.org/CVE-2019-20907 https://security.archlinux.org/CVE-2020-8492 https://security.archlinux.org/CVE-2020-26116 https://security.archlinux.org/CVE-2020-27619 https://security.archlinux.org/CVE-2021-3177 https://security.archlinux.org/CVE-2021-23336
Workaround
None.
