Debian Security Advisory
DLA-2337-1 python2.7 -- LTS security update
- Date Reported:
- 22 Aug 2020
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2018-20852, CVE-2019-5010, CVE-2019-9636, CVE-2019-9740, CVE-2019-9947, CVE-2019-9948, CVE-2019-10160, CVE-2019-16056, CVE-2019-20907.
- More information:
Multiple vulnerabilities were discovered in Python2.7, an interactive high-level object-oriented language.
By using a malicious server an attacker might steal cookies that are meant for other domains.
NULL pointer dereference using a specially crafted X509 certificate.
Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization resulting in information disclosure (credentials, cookies, etc. that are cached against a given hostname). A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly.
An issue was discovered in urllib2 where CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the query string after a ? character) followed by an HTTP header or a Redis command.
An issue was discovered in urllib2 where CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the path component of a URL that lacks a ? character) followed by an HTTP header or a Redis command. This is similar to the CVE-2019-9740 query string issue.
urllib supports the local_file: scheme, which makes it easier for remote attackers to bypass protection mechanisms that blacklist file: URIs, as demonstrated by triggering a urllib.urlopen('local_file:///etc/passwd') call.
A security regression of CVE-2019-9636 was discovered which still allows an attacker to exploit CVE-2019-9636 by abusing the user and password parts of a URL. When an application parses user-supplied URLs to store cookies, authentication credentials, or other kind of information, it is possible for an attacker to provide specially crafted URLs to make the application locate host-related information (e.g. cookies, authentication data) and send them to a different host than where it should, unlike if the URLs had been correctly parsed. The result of an attack may vary based on the application.
The email module wrongly parses email addresses that contain multiple @ characters. An application that uses the email module and implements some kind of checks on the From/To headers of a message could be tricked into accepting an email address that should be denied.
Opening a crafted tar file could result in an infinite loop due to missing header validation.
For Debian 9 stretch, these problems have been fixed in version 2.7.13-2+deb9u4.
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