The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1418-1 advisory.

  - Denial of service when identifying crafted invalid RFCs [fedora-all] (CVE-2021-3733)

  - client can enter an infinite loop on a 100 Continue response from the server [fedora-all] (CVE-2021-3737)

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

The remote SUSE Linux SLED15 / SLES15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:4015-1 advisory.

  - There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince     another local or adjacent user to start a pydoc server could access the server and use it to disclose     sensitive information belonging to the other user that they would not normally be able to access. The     highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9,     Python versions before 3.9.3 and Python versions before 3.10.0a7. (CVE-2021-3426)

  - There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.
    (CVE-2021-3733)

  - A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may     allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,     consuming CPU time. The highest threat from this vulnerability is to system availability. (CVE-2021-3737)

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 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5199-1 advisory.

    It was discovered that the urllib.request.AbstractBasicAuthHandler class

    in Python contains regex with a quadratic worst-case time complexity.

    Specially crafted traffic from a malicious HTTP server could cause a regular

    expression denial of service (ReDoS) condition for a client. (CVE-2021-3733)

    It was discovered that the Python urllib http client could enter into an infinite

    loop when incorrectly handling certain server responses (100 Continue response).

    Specially crafted traffic from a malicious HTTP server could cause a denial of

    service (DoS) condition for a client. (CVE-2021-3737)

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 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5200-1 advisory.

    It was discovered that the urllib.request.AbstractBasicAuthHandler class

    in Python contains regex allowing for catastrophic backtracking. Specially

    crafted traffic from a malicious HTTP server could cause a regular expression

    denial of service (ReDoS) condition for a client. (CVE-2020-8492)

    It was discovered that the urllib.request.AbstractBasicAuthHandler class

    in Python contains regex with a quadratic worst-case time complexity.

    Specially crafted traffic from a malicious HTTP server could cause a regular

    expression denial of service (ReDoS) condition for a client. (CVE-2021-3733)

    It was discovered that the Python urllib http client could enter into an infinite

    loop when incorrectly handling certain server responses (100 Continue response).

    Specially crafted traffic from a malicious HTTP server could cause a denial of

    service (DoS) condition for a client. (CVE-2021-3737)

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.

According to the versions of the python3 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may     allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,     consuming CPU time. The highest threat from this vulnerability is to system availability. (CVE-2021-3737)

  - There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.
    (CVE-2021-3733)

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

According to the versions of the python packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.
    (CVE-2021-3733)

  - A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may     allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,     consuming CPU time. The highest threat from this vulnerability is to system availability. (CVE-2021-3737)

  - A flaw was found in Python, specifically in the FTP (File Transfer Protocol) client library in PASV     (passive) mode. The issue is how the FTP client trusts the host from the PASV response by default. This     flaw allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting back     to a given IP address and port. This vulnerability could lead to FTP client scanning ports, which     otherwise would not have been possible. (CVE-2021-4189)

  - A flaw was found in Python, specifically within the urllib.parse module. This module helps break Uniform     Resource Locator (URL) strings into components. The issue involves how the urlparse method does not     sanitize input and allows characters like '\r' and '\n' in the URL path. This flaw allows an attacker to     input a crafted URL, leading to injection attacks. This flaw affects Python versions prior to 3.10.0b1,     3.9.5, 3.8.11, 3.7.11 and 3.6.14. (CVE-2022-0391)

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

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:4160 advisory.

  - An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling     the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute     allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS     code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
    (CVE-2021-28957)

  - In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP     address string. This (in some situations) allows attackers to bypass access control that is based on IP     addresses. (CVE-2021-29921)

  - An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in     the authority component, the authority regular expression exhibits catastrophic backtracking, causing a     denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
    (CVE-2021-33503)

  - There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince     another local or adjacent user to start a pydoc server could access the server and use it to disclose     sensitive information belonging to the other user that they would not normally be able to access. The     highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9,     Python versions before 3.9.3 and Python versions before 3.10.0a7. (CVE-2021-3426)

  - A flaw was found in python-pip in the way it handled Unicode separators in git references. A remote     attacker could possibly use this issue to install a different revision on a repository. The highest threat     from this vulnerability is to data integrity. This is fixed in python-pip version 21.1. (CVE-2021-3572)

  - There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.
    (CVE-2021-3733)

  - A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may     allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,     consuming CPU time. The highest threat from this vulnerability is to system availability. (CVE-2021-3737)

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

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2021:4057 advisory.

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

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2022:1821 advisory.

    * python: urllib: Regular expression DoS in AbstractBasicAuthHandler (CVE-2021-3733)

    * python: ftplib should not use the host from the PASV response (CVE-2021-4189)

    * python-lxml: HTML Cleaner allows crafted and SVG embedded scripts to pass through (CVE-2021-43818)

    * python: urllib.parse does not sanitize URLs containing ASCII newline and tabs (CVE-2022-0391)

    * python: urllib: HTTP client possible infinite loop on a 100 Continue response (CVE-2021-3737)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2022:1821 advisory.

  - There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.
    (CVE-2021-3733)

  - A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may     allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,     consuming CPU time. The highest threat from this vulnerability is to system availability. (CVE-2021-3737)

  - A flaw was found in Python, specifically in the FTP (File Transfer Protocol) client library in PASV     (passive) mode. The issue is how the FTP client trusts the host from the PASV response by default. This     flaw allows an attacker to set up a malicious FTP server that can trick FTP clients into connecting back     to a given IP address and port. This vulnerability could lead to FTP client scanning ports, which     otherwise would not have been possible. (CVE-2021-4189)

  - lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML     Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG     files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should     upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available. (CVE-2021-43818)

  - A flaw was found in Python, specifically within the urllib.parse module. This module helps break Uniform     Resource Locator (URL) strings into components. The issue involves how the urlparse method does not     sanitize input and allows characters like '\r' and '\n' in the URL path. This flaw allows an attacker to     input a crafted URL, leading to injection attacks. This flaw affects Python versions prior to 3.10.0b1,     3.9.5, 3.8.11, 3.7.11 and 3.6.14. (CVE-2022-0391)

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP     server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of     Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the     server to the client. The greatest threat that this flaw poses is to application availability.
    (CVE-2021-3733)

Note that Nessus relies on the presence of the package as reported by the vendor.

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.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4160 advisory.

    - Security fix for CVE-2021-28957     Resolves: rhbz#1941534
    - Fixes CVE-2020-27783 and another vulnerability in the HTML Cleaner
    - Fix for CVE-2021-33503 Catastrophic backtracking in URL authority parser     Resolves: rhbz#1968074
    - Fix CVE-2021-29921: Improper input validation of octal strings in the ipaddress module     Resolves: rhbz#1957458
    - Security fix for CVE-2021-3426: information disclosure via pydoc     Resolves: rhbz#1935913

    python3x-pip
    - Fix for CVE-2021-33503 Catastrophic backtracking in URL authority parser     Resolves: rhbz#1968074
    - Fix for CVE-2021-3572 - pip incorrectly handled unicode separators in git references     Resolves: rhbz#1962856

Tenable has extracted the preceding description block directly from the Oracle Linux 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
154765	openSUSE 15 Security Update : python (openSUSE-SU-2021:1418-1)	Nessus	SuSE Local Security Checks	11/1/2021	11/27/2023	high
156050	SUSE SLED15 / SLES15 Security Update : python3 (SUSE-SU-2021:4015-1)	Nessus	SuSE Local Security Checks	12/14/2021	7/14/2023	medium
156168	Ubuntu 18.04 LTS : Python vulnerabilities (USN-5199-1)	Nessus	Ubuntu Local Security Checks	12/18/2021	8/27/2024	high
156171	Ubuntu 18.04 LTS : Python vulnerabilities (USN-5200-1)	Nessus	Ubuntu Local Security Checks	12/18/2021	8/27/2024	high
157194	EulerOS 2.0 SP9 : python3 (EulerOS-SA-2022-1013)	Nessus	Huawei Local Security Checks	1/28/2022	11/17/2023	high
170793	EulerOS Virtualization 3.0.2.2 : python (EulerOS-SA-2023-1284)	Nessus	Huawei Local Security Checks	1/30/2023	9/5/2023	high
184693	Rocky Linux 8 : python39:3.9 and python39-devel:3.9 (RLSA-2021:4160)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/14/2023	critical
157542	AlmaLinux 8 : python3 (ALSA-2021:4057)	Nessus	Alma Linux Local Security Checks	2/9/2022	11/13/2023	medium
161115	AlmaLinux 8 : python27:2.7 (ALSA-2022:1821)	Nessus	Alma Linux Local Security Checks	5/12/2022	1/13/2025	high
184762	Rocky Linux 8 : python27:2.7 (RLSA-2022:1821)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/14/2023	high
224011	Linux Distros Unpatched Vulnerability : CVE-2021-3733	Nessus	Misc.	3/5/2025	8/20/2025	medium
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	9/18/2024	critical
155967	Oracle Linux 8 : python39:3.9 / and / python39-devel:3.9 (ELSA-2021-4160)	Nessus	Oracle Linux Local Security Checks	12/10/2021	11/2/2024	critical

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