-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-2628-1 debian-...@lists.debian.org https://www.debian.org/lts/security/ Anton Gladky April 17, 2021 https://wiki.debian.org/LTS - -------------------------------------------------------------------------
Package : python2.7 Version : 2.7.13-2+deb9u5 CVE ID : CVE-2019-16935 CVE-2021-23336 Two security issues have been discovered in python2.7: CVE-2019-16935 The documentation XML-RPC server in Python 2.7 has XSS via the server_title field. This occurs in Lib/DocXMLRPCServer.py in Python 2.x, and in Lib/xmlrpc/server.py in Python 3.x. If set_server_title is called with untrusted input, arbitrary JavaScript can be delivered to clients that visit the http URL for this server. CVE-2021-23336 The Python2.7 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. **Attention, API-change!** Please be sure your software is working properly if it uses `urllib.parse.parse_qs` or `urllib.parse.parse_qsl`, `cgi.parse` or `cgi.parse_multipart`. Earlier Python versions allowed using both ``;`` and ``&`` as query parameter separators in `urllib.parse.parse_qs` and `urllib.parse.parse_qsl`. Due to security concerns, and to conform with newer W3C recommendations, this has been changed to allow only a single separator key, with ``&`` as the default. This change also affects `cgi.parse` and `cgi.parse_multipart` as they use the affected functions internally. For more details, please see their respective documentation. For Debian 9 stretch, these problems have been fixed in version 2.7.13-2+deb9u5. We recommend that you upgrade your python2.7 packages. For the detailed security status of python2.7 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/python2.7 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEu71F6oGKuG/2fnKF0+Fzg8+n/wYFAmB7N4EACgkQ0+Fzg8+n /wb/qxAAj6FN++ub8ZbGfOH4my+nWTGASrjSPjUk4+XSA1JsKxTgXUfqEeYW1+ms N7JvsaO4tgS946tVvlxDEokjso3BH7ljJQHpNKhbqsDmIUHvK3Fm2Xrg1J750gGl dsJjkUx85Yq/+B8JyidJMrsj//AZVsd76B9J5cSw47gyowLa++fAT4Lbk1rTCajO FL80pGEA2Mmw4c/HA9qgLvNtMsQWlgQCIObK20d0mQSzvCA5X13SM5U4bhbsoAqW AM3mEWOyFs53MssKBych940sqA2YZKUkS7voL2BzjXANSTAFI2rPiQn3kPaoNtl6 7v9JMDYuhZypj2VdNOWS0NkZGUtBI9RcsLAIUdrrzLIDEQ0tvgOBWHakvS0W/K7H IZOUoBoyRSU573dhGC4WaQMgaaYmk/E+sWngy6Qu6G4FmSZOX/ANeX1NkU8JGBJ7 Ej9FUn9/4nOkYSwspznueXuFsSFEtmBQD9hZ9xV+L8xxyASlT/5dORsIYYkz2xX3 E6yJ5foLuk0xqCXH5tBlHoS/9Wy2ccoOEltYZCXFvvA6vL7izrmXWxOniOPsQ6b8 cOnQBHHXu0ervBD017MgXPfpmjXlc8STlF+oz35TYEZ6K8Q0caCYK7vKHUCVgSev YcAZoIrwEV43nWsSWjK03NnZfLfLCleoTtsyB7rwvokXEZrTErs= =OkPp -----END PGP SIGNATURE-----