Multiple vulnerabilities were discovered in Python, an interactive high-level object-oriented language, including 

CVE-2018-14647

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.

CVE-2019-5010

NULL pointer dereference using a specially crafted X509 certificate.

CVE-2019-9636

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.

CVE-2019-9740

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.

CVE-2019-9947

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.

CVE-2019-9948

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.

CVE-2019-10160

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.

For Debian 8 'Jessie', these problems have been fixed in version 2.7.9-2+deb8u3.

We recommend that you upgrade your python2.7 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4127-1 advisory.

    It was discovered that Python incorrectly handled certain pickle files. An attacker could possibly use     this issue to consume memory, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS     and Ubuntu 18.04 LTS. (CVE-2018-20406)

    It was discovered that Python incorrectly validated the domain when handling cookies. An attacker could     possibly trick Python into sending cookies to the wrong domain. (CVE-2018-20852)

    Jonathan Birch and Panayiotis Panayiotou discovered that Python incorrectly handled Unicode encoding     during NFKC normalization. An attacker could possibly use this issue to obtain sensitive information.
    (CVE-2019-9636, CVE-2019-10160)

    Colin Read and Nicolas Edet discovered that Python incorrectly handled parsing certain X509 certificates.
    An attacker could possibly use this issue to cause Python to crash, resulting in a denial of service. This     issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-5010)

    It was discovered that Python incorrectly handled certain urls. A remote attacker could possibly use this     issue to perform CRLF injection attacks. (CVE-2019-9740, CVE-2019-9947)

    Sihoon Lee discovered that Python incorrectly handled the local_file: scheme. A remote attacker could     possibly use this issue to bypass blocklist meschanisms. (CVE-2019-9948)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6891-1 advisory.

    It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this     issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2015-20107)

    It was discovered that Python incorrectly used regular expressions vulnerable to catastrophic     backtracking. A remote attacker could possibly use this issue to cause a denial of service. This issue     only affected Ubuntu 14.04 LTS. (CVE-2018-1060, CVE-2018-1061)

    It was discovered that Python failed to initialize Expats hash salt. A remote attacker could possibly     use this issue to cause hash collisions, leading to a denial of service. This issue only affected Ubuntu     14.04 LTS. (CVE-2018-14647)

    It was discovered that Python incorrectly handled certain pickle files. An attacker could possibly use     this issue to consume memory, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS.
    (CVE-2018-20406)

    It was discovered that Python incorrectly validated the domain when handling cookies. An attacker could     possibly trick Python into sending cookies to the wrong domain. This issue only affected Ubuntu 14.04 LTS.
    (CVE-2018-20852)

    Jonathan Birch and Panayiotis Panayiotou discovered that Python incorrectly handled Unicode encoding     during NFKC normalization. An attacker could possibly use this issue to obtain sensitive information. This     issue only affected Ubuntu 14.04 LTS. (CVE-2019-9636, CVE-2019-10160)

    It was discovered that Python incorrectly parsed certain email addresses. A remote attacker could possibly     use this issue to trick Python applications into accepting email addresses that should be denied. This     issue only affected Ubuntu 14.04 LTS. (CVE-2019-16056)

    It was discovered that the Python documentation XML-RPC server incorrectly handled certain fields. A     remote attacker could use this issue to execute a cross-site scripting (XSS) attack. This issue only     affected Ubuntu 14.04 LTS. (CVE-2019-16935)

    It was discovered that Python documentation had a misleading information. A security issue could be     possibly caused by wrong assumptions of this information. This issue only affected Ubuntu 14.04 LTS and     Ubuntu 18.04 LTS. (CVE-2019-17514)

    It was discovered that Python incorrectly stripped certain characters from requests. A remote attacker     could use this issue to perform CRLF injection. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04     LTS. (CVE-2019-18348)

    It was discovered that Python incorrectly handled certain TAR archives. An attacker could possibly use     this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2019-20907)

    Colin Read and Nicolas Edet discovered that Python incorrectly handled parsing certain X509 certificates.
    An attacker could possibly use this issue to cause Python to crash, resulting in a denial of service. This     issue only affected Ubuntu 14.04 LTS. (CVE-2019-5010)

    It was discovered that incorrectly handled certain ZIP files. An attacker could possibly use this issue to     cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-9674)

    It was discovered that Python incorrectly handled certain urls. A remote attacker could possibly use this     issue to perform CRLF injection attacks. This issue only affected Ubuntu 14.04 LTS. (CVE-2019-9740,     CVE-2019-9947)

    Sihoon Lee discovered that Python incorrectly handled the local_file: scheme. A remote attacker could     possibly use this issue to bypass blocklist meschanisms. This issue only affected Ubuntu 14.04 LTS.
    (CVE-2019-9948)

    It was discovered that Python incorrectly handled certain IP values. An attacker could possibly use this     issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2020-14422)

    It was discovered that Python incorrectly handled certain character sequences. A remote attacker could     possibly use this issue to perform CRLF injection. This issue only affected Ubuntu 14.04 LTS and Ubuntu     18.04 LTS. (CVE-2020-26116)

    It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this     issue to execute arbitrary code or cause a denial of service. This issue only affected Ubuntu 14.04 LTS.
    (CVE-2020-27619, CVE-2021-3177)

    It was discovered that Python incorrectly handled certain HTTP requests. An attacker could possibly use     this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2020-8492)

    It was discovered that the Python stdlib ipaddress API incorrectly handled octal strings. A remote     attacker could possibly use this issue to perform a wide variety of attacks, including bypassing certain     access restrictions. This issue only affected Ubuntu 18.04 LTS. (CVE-2021-29921)

    David Schwrer discovered that Python incorrectly handled certain inputs. An attacker could possibly use     this issue to expose sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2021-3426)

    It was discovered that Python incorrectly handled certain RFCs. An attacker could possibly use this issue     to cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2021-3733)

    It was discovered that Python incorrectly handled certain server responses. An attacker could possibly use     this issue to cause a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2021-3737)

    It was discovered that Python incorrectly handled certain FTP requests. An attacker could possibly use     this issue to expose sensitive information. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04     LTS. (CVE-2021-4189)

    It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this     issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2022-0391)

    Devin Jeanpierre discovered that Python incorrectly handled sockets when the multiprocessing module was     being used. A local attacker could possibly use this issue to execute arbitrary code and escalate     privileges. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-42919)

    It was discovered that Python incorrectly handled certain inputs. If a user or an automated system were     tricked into running a specially crafted input, a remote attacker could possibly use this issue to cause a     denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 18.04 LTS and Ubuntu 22.04 LTS.
    (CVE-2022-45061, CVE-2023-24329)

    It was discovered that Python incorrectly handled certain scripts. An attacker could possibly use this     issue to execute arbitrary code or cause a crash. This issue only affected Ubuntu 14.04 LTS and Ubuntu     18.04 LTS. (CVE-2022-48560)

    It was discovered that Python incorrectly handled certain plist files. If a user or an automated system     were tricked into processing a specially crafted plist file, an attacker could possibly use this issue to     consume resources, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu     18.04 LTS. (CVE-2022-48564)

    It was discovered that Python did not properly handle XML entity declarations in plist files. An attacker     could possibly use this vulnerability to perform an XML External Entity (XXE) injection, resulting in a     denial of service or information disclosure. This issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04     LTS. (CVE-2022-48565)

    It was discovered that Python did not properly provide constant-time processing for a crypto operation. An     attacker could possibly use this issue to perform a timing attack and recover sensitive information. This     issue only affected Ubuntu 14.04 LTS and Ubuntu 18.04 LTS. (CVE-2022-48566)

    It was discovered that Python instances of ssl.SSLSocket were vulnerable to a bypass of the TLS handshake.
    An attacker could possibly use this issue to cause applications to treat unauthenticated received data     before TLS handshake as authenticated data after TLS handshake. This issue only affected Ubuntu 14.04 LTS,     Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2023-40217)

    It was discovered that Python incorrectly handled null bytes when normalizing pathnames. An attacker could     possibly use this issue to bypass certain filename checks. This issue only affected Ubuntu 22.04 LTS.
    (CVE-2023-41105)

    It was discovered that Python incorrectly handled privilege with certain parameters. An attacker could     possibly use this issue to maintain the original processes' groups before starting the new process. This     issue only affected Ubuntu 23.10. (CVE-2023-6507)

    It was discovered that Python incorrectly handled symlinks in temp files. An attacker could possibly use     this issue to modify the permissions of files. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04     LTS, Ubuntu 22.04 LTS and Ubuntu 23.10. (CVE-2023-6597)

    It was discovered that Python incorrectly handled certain crafted zip files. An attacker could possibly     use this issue to crash the program, resulting in a denial of service. (CVE-2024-0450)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
126222	Debian DLA-1834-1 : python2.7 security update	Nessus	Debian Local Security Checks	6/25/2019	5/14/2024	critical
128631	Ubuntu 16.04 LTS / 18.04 LTS : Python vulnerabilities (USN-4127-1)	Nessus	Ubuntu Local Security Checks	9/10/2019	9/3/2025	critical
202187	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 23.10 : Python vulnerabilities (USN-6891-1)	Nessus	Ubuntu Local Security Checks	7/11/2024	9/3/2025	critical

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