Debian LTS: Security Advisory for python2.7 (DLA-2628-1)

Published: 2021-04-18 03:00:08
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:M/Au:N/C:N/I:P/A:N

Summary:
The remote host is missing an update for the 'python2.7' Linux Distribution Package(s) announced via the DLA-2628-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
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 semicolon 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.

Affected Versions:
'python2.7' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 9 stretch, these problems have been fixed in version 2.7.13-2+deb9u5. We recommend that you upgrade your python2.7 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2019-16935
https://nvd.nist.gov/vuln/detail/CVE-2021-23336

References:

https://lists.debian.org/debian-lts-announce/2021/04/msg00015.html
https://security-tracker.debian.org/tracker/DLA-2628-1

Severity
Medium
CVSS Score
4.3
Published
2021-04-18
Modified
2021-04-19
Category
Debian Local Security Checks

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