The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3254 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    The following packages have been upgraded to a later upstream version: rh-python38-python (3.8.11).
    (BZ#1969523)

    Security Fix(es):

    * python-cryptography: Bleichenbacher timing oracle attack against RSA decryption (CVE-2020-25659)

    * python: Unsafe use of eval() on data retrieved via HTTP in the test suite (CVE-2020-27619)

    * python-lxml: mXSS due to the use of improper parser (CVE-2020-27783)

    * python-jinja2: ReDoS vulnerability due to the sub-pattern (CVE-2020-28493)

    * python-cryptography: Large inputs for symmetric encryption can trigger integer overflow leading to     buffer overflow (CVE-2020-36242)

    * python: Stack-based buffer overflow in PyCArg_repr in _ctypes/callproc.c (CVE-2021-3177)

    * python: Information disclosure via pydoc (CVE-2021-3426)

    * python-babel: Relative path traversal allows attacker to load arbitrary locale files and execute     arbitrary code (CVE-2021-20095)

    * python: Web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a semicolon in     query parameters (CVE-2021-23336)

    * python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS (CVE-2021-28957)

    * python-ipaddress: Improper input validation of octal strings (CVE-2021-29921)

    * python-urllib3: ReDoS in the parsing of authority part of URL (CVE-2021-33503)

    * python-pip: Incorrect handling of unicode separators in git references (CVE-2021-3572)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional information

    * Changes in the default separator for the Python urllib parsing functions

    To mitigate the Web Cache Poisoning CVE-2021-23336 in the Python urllib library, the default separator for     the urllib.parse.parse_qsl and urllib.parse.parse_qs functions is being changed from both ampersand (&)     and semicolon (;) to only an ampersand.

    The change of the default separator is potentially backwards incompatible, therefore Red Hat provides a     way to configure the behavior in Python packages where the default separator has been changed. In     addition, the affected urllib parsing functions issue a warning if they detect that a customers     application has been affected by the change.

    For more information, see the Knowledgebase article Mitigation of Web Cache Poisoning in the Python     urllib library (CVE-2021-23336) linked from the References section.

    * The Python ipaddress module no longer allows leading zeros in IPv4 addresses

    To mitigate CVE-2021-29921, the Python ipaddress module now rejects IPv4 addresses with leading zeros     with an AddressValueError: Leading zeros are not permitted error.

    Customers who rely on the previous behavior can pre-process their IPv4 address inputs to strip the leading     zeros off. For details, see the Red Hat Software Collections 3.7 Release Notes.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-4162 advisory.

  - The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before     3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and     urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query     parameters using a semicolon (;), they can cause a difference in the interpretation of the request between     the proxy (running with default configuration) and the server. This can result in malicious requests being     cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and     therefore would not include it in a cache key of an unkeyed parameter. (CVE-2021-23336)

  - psutil (aka python-psutil) through 5.6.5 can have a double free. This occurs because of refcount     mishandling within a while or for loop that converts system data into a Python object. (CVE-2019-18874)

  - Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing     serialized Python objects) via directory traversal, leading to code execution. (CVE-2021-42771)

  - 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 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)

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

ID	名稱	產品	系列	已發布	已更新	嚴重性
152781	RHEL 7 : rh-python38 (RHSA-2021:3254)	Nessus	Red Hat Local Security Checks	2021/8/24	2025/9/10	high
155969	Oracle Linux 8 : python38:3.8 / and / python38-devel:3.8 (ELSA-2021-4162)	Nessus	Oracle Linux Local Security Checks	2021/12/10	2025/9/23	high

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