Debian Security Advisory
DLA-1835-1 python3.4 -- LTS security update
- Date Reported:
- 24 Jun 2019
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 921039, Bug 924072.
In Mitre's CVE dictionary: CVE-2018-14647, CVE-2019-9636, CVE-2019-9740, CVE-2019-9947.
- More information:
Multiple vulnerabilities were discovered in Python, an interactive high-level object-oriented language, including
Python's elementtree C accelerator failed to initialise Expat's hash salt during initialization. This could make it easy to conduct denial of service attacks against Expat by constructing an XML document that would cause pathological hash collisions in Expat's internal data structures, consuming large amounts CPU and RAM.
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 urllib 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 urllib 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.
For Debian 8
Jessie, these problems have been fixed in version 3.4.2-1+deb8u3.
We recommend that you upgrade your python3.4 packages.
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