ALAS-2020-1429


Amazon Linux AMI Security Advisory: ALAS-2020-1429
Advisory Release Date: 2020-08-27 02:29 Pacific
Advisory Updated Date: 2020-08-31 20:56 Pacific
Severity: Medium

Issue Overview:

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-2019-20907 )

An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. 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 host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.) A CRLF injection flaw was discovered in python in the way URLs are handled when doing an HTTP/HTTPS connection (e.g. through urlopen() or HTTPConnection). An attacker who can control the url parameter passed to urlopen method in the urllib/urllib2 modules can inject CRLF sequences and HTTP headers by abusing the "host" part of the URL. (CVE-2019-18348 )


Affected Packages:

python34, python35


Issue Correction:
Run yum update python34 to update your system.
Run yum update python35 to update your system.

New Packages:
i686:
    python34-debuginfo-3.4.10-1.51.amzn1.i686
    python34-devel-3.4.10-1.51.amzn1.i686
    python34-libs-3.4.10-1.51.amzn1.i686
    python34-tools-3.4.10-1.51.amzn1.i686
    python34-test-3.4.10-1.51.amzn1.i686
    python34-3.4.10-1.51.amzn1.i686
    python35-test-3.5.9-1.27.amzn1.i686
    python35-debuginfo-3.5.9-1.27.amzn1.i686
    python35-libs-3.5.9-1.27.amzn1.i686
    python35-devel-3.5.9-1.27.amzn1.i686
    python35-tools-3.5.9-1.27.amzn1.i686
    python35-3.5.9-1.27.amzn1.i686

src:
    python34-3.4.10-1.51.amzn1.src
    python35-3.5.9-1.27.amzn1.src

x86_64:
    python34-test-3.4.10-1.51.amzn1.x86_64
    python34-3.4.10-1.51.amzn1.x86_64
    python34-devel-3.4.10-1.51.amzn1.x86_64
    python34-libs-3.4.10-1.51.amzn1.x86_64
    python34-tools-3.4.10-1.51.amzn1.x86_64
    python34-debuginfo-3.4.10-1.51.amzn1.x86_64
    python35-devel-3.5.9-1.27.amzn1.x86_64
    python35-debuginfo-3.5.9-1.27.amzn1.x86_64
    python35-test-3.5.9-1.27.amzn1.x86_64
    python35-libs-3.5.9-1.27.amzn1.x86_64
    python35-3.5.9-1.27.amzn1.x86_64
    python35-tools-3.5.9-1.27.amzn1.x86_64