GLSA-202305-02 : Python, PyPy3: Multiple Vulnerabilities

critical Nessus Plugin ID 175043


The remote host is affected by the vulnerability described in GLSA-202305-02 (Python, PyPy3: Multiple Vulnerabilities)

- In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file. This may allow attackers to inject shell commands into applications that call mailcap.findmatch with untrusted input (if they lack validation of user-provided filenames or arguments). The fix is also back-ported to 3.7, 3.8, 3.9 (CVE-2015-20107)

- A vulnerability was found in openstack-nova's console proxy, noVNC. By crafting a malicious URL, noVNC could be made to redirect to any desired URL. (CVE-2021-3654)

- The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn't given via proxy_config) doesn't verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted.

- ** DISPUTED ** Python 3.x through 3.10 has an open redirection vulnerability in lib/http/ due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure.
NOTE: this is disputed by a third party because the http.server.html documentation page states Warning:
http.server is not recommended for production. It only implements basic security checks. (CVE-2021-28861)

- 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)

- 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)

- The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer overflow that allows attackers to execute arbitrary code or eliminate expected cryptographic properties.
This occurs in the sponge function interface. (CVE-2022-37454)

- Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non- default configuration. The Python multiprocessing library, when used with the forkserver start method on Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which in many system configurations means any user on the same machine. Pickles can execute arbitrary code.
Thus, this allows for local user privilege escalation to the user that any forkserver process is running as. Setting multiprocessing.util.abstract_sockets_supported to False is a workaround. The forkserver start method for multiprocessing is not the default start method. This issue is Linux specific because only Linux supports abstract namespace sockets. CPython before 3.9 does not make use of Linux abstract namespace sockets by default. Support for users manually specifying an abstract namespace socket was added as a bugfix in 3.7.8 and 3.8.3, but users would need to make specific uncommon API calls in order to do that in CPython before 3.9. (CVE-2022-42919)

- An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname.
For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16. (CVE-2022-45061)

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


All Python 3.8 users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-lang/python-3.8.15_p3:3.8 All Python 3.9 users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-lang/python-3.9.15_p3:3.9 All Python 3.10 users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-lang/python-3.10.8_p3:3.10 All Python 3.11 users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-lang/python-3.11.0_p2:3.11 All Python 3.12 users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-lang/python-3.12.0_alpha1_p2 All PyPy3 users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose >=dev-python/pypy3-7.3.9_p9

See Also

Plugin Details

Severity: Critical

ID: 175043

File Name: gentoo_GLSA-202305-02.nasl

Version: 1.0

Type: local

Published: 5/3/2023

Updated: 5/3/2023

Supported Sensors: Nessus

Risk Information


Risk Factor: High

Score: 7.4


Risk Factor: High

Base Score: 8

Temporal Score: 6.6

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:C/A:P

CVSS Score Source: CVE-2015-20107


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

CVSS Score Source: CVE-2022-37454

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:pypy3, p-cpe:/a:gentoo:linux:python, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/3/2023

Vulnerability Publication Date: 3/15/2021

Reference Information

CVE: CVE-2015-20107, CVE-2021-28363, CVE-2021-28861, CVE-2021-29921, CVE-2021-3654, CVE-2022-0391, CVE-2022-37454, CVE-2022-42919, CVE-2022-45061