Important: python

Issue Overview:

A null pointer dereference vulnerability was found in the certificate parsing code in Python. This causes a denial of service to applications when parsing specially crafted certificates. This vulnerability is unlikely to be triggered if application enables SSL/TLS certificate validation and accepts certificates only from trusted root certificate authorities. (CVE-2019-5010)

Python 2.7.16 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: 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. (CVE-2019-9636)

A flaw was found in the way catastrophic backtracking was implemented in python’s pop3lib’s apop() method. An attacker could use this flaw to cause denial of service. (CVE-2018-1060)

Modules/_pickle.c in Python 2.7.16 has an integer overflow via a large LONG_BINPUT value that is mishandled during a “resize to twice the size” attempt. This issue might cause memory exhaustion, but is only relevant if the pickle format is used for serializing tens or hundreds of gigabytes of data. (CVE-2018-20406)

A flaw was found in the way catastrophic backtracking was implemented in python’s difflib.IS_LINE_JUNK method. An attacker could use this flaw to cause denial of service. (CVE-2018-1061)

Affected Packages:

python

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update python to update your system.

New Packages:

aarch64:  
    python-2.7.16-1.amzn2.0.1.aarch64  
    python-libs-2.7.16-1.amzn2.0.1.aarch64  
    python-devel-2.7.16-1.amzn2.0.1.aarch64  
    python-tools-2.7.16-1.amzn2.0.1.aarch64  
    tkinter-2.7.16-1.amzn2.0.1.aarch64  
    python-test-2.7.16-1.amzn2.0.1.aarch64  
    python-debug-2.7.16-1.amzn2.0.1.aarch64  
    python-debuginfo-2.7.16-1.amzn2.0.1.aarch64  
  
i686:  
    python-2.7.16-1.amzn2.0.1.i686  
    python-libs-2.7.16-1.amzn2.0.1.i686  
    python-devel-2.7.16-1.amzn2.0.1.i686  
    python-tools-2.7.16-1.amzn2.0.1.i686  
    tkinter-2.7.16-1.amzn2.0.1.i686  
    python-test-2.7.16-1.amzn2.0.1.i686  
    python-debug-2.7.16-1.amzn2.0.1.i686  
    python-debuginfo-2.7.16-1.amzn2.0.1.i686  
  
src:  
    python-2.7.16-1.amzn2.0.1.src  
  
x86_64:  
    python-2.7.16-1.amzn2.0.1.x86_64  
    python-libs-2.7.16-1.amzn2.0.1.x86_64  
    python-devel-2.7.16-1.amzn2.0.1.x86_64  
    python-tools-2.7.16-1.amzn2.0.1.x86_64  
    tkinter-2.7.16-1.amzn2.0.1.x86_64  
    python-test-2.7.16-1.amzn2.0.1.x86_64  
    python-debug-2.7.16-1.amzn2.0.1.x86_64  
    python-debuginfo-2.7.16-1.amzn2.0.1.x86_64  

Additional References

Red Hat: CVE-2018-1060, CVE-2018-1061, CVE-2018-20406, CVE-2019-5010, CVE-2019-9636

Mitre: CVE-2018-1060, CVE-2018-1061, CVE-2018-20406, CVE-2019-5010, CVE-2019-9636