CVE-2023-40217 Security feature bypass in n/a
Attackers can bypass TLS client certificate authentication on Python servers by exploiting a race condition in socket closure, allowing unauthenticated data access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-40217?
CVE-2023-40217 is a medium-severity vulnerability in Python Python, published on 25 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Python before 3.8.18, 3.9.x before 3.9.18, 3.10.x before 3.10.13, and 3.11.x before 3.11.5. It primarily affects servers (such as HTTP servers) that use TLS client authentication. If a TLS server-side socket is created, receives data into the socket buffer, and then is closed quickly, there is a brief window where the SSLSocket instance will detect the socket as "not connected" and won't initiate a handshake, but buffered data will still be readable from the socket buffer. This data will not be authenticated if the server-side TLS peer is expecting client certificate authentication, and is indistinguishable from valid TLS stream data. Data is limited in size to the amount that will fit in the buffer. (The TLS connection cannot directly be used for data exfiltration because the vulnerable code path requires that the connection be closed on initialization of the SSLSocket.)
Which versions are affected by CVE-2023-40217?
3 open source packages ship an affected version, including libpython, python and python-min. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
libpython Bitnami | All versions | 3.8.18, 3.9.18, 3.10.13, 3.11.5 |
python Bitnami | All versions | 3.8.18, 3.9.18, 3.10.13, 3.11.5 |
python-min Bitnami | All versions | 3.8.18, 3.9.18, 3.10.13, 3.11.5 |
Linux distribution packages (37)
babel AlmaLinux:8 | All versions | 2.5.1-10.module_el8.6.0+2781+fed64c13 |
platform-python AlmaLinux:8 | All versions | 3.6.8-51.el8_8.2.alma.1 |
platform-python-debug AlmaLinux:8 | All versions | 3.6.8-51.el8_8.2.alma.1 |
platform-python-devel AlmaLinux:8 | All versions | 3.6.8-51.el8_8.2.alma.1 |
python-nose-docs AlmaLinux:8 | All versions | 1.3.7-31.module_el8.6.0+2781+fed64c13 |
python-psycopg2-doc AlmaLinux:8 | All versions | 2.7.5-7.module_el8.6.0+2781+fed64c13 |
python-psycopg2-doc AlmaLinux:8 | All versions | 2.7.5-7.module_el8.6.0+3162+01a09e5a |
python-sqlalchemy-doc AlmaLinux:8 | All versions | 1.3.2-2.module_el8.6.0+2781+fed64c13 |
python2 AlmaLinux:8 | All versions | 2.7.18-13.module_el8.8.0+3663+627ce7bb.2.alma.1 |
python2-Cython AlmaLinux:8 | All versions | 0.28.1-7.module_el8.6.0+2781+fed64c13 |
python2-Cython AlmaLinux:8 | All versions | 0.28.1-7.module_el8.6.0+3162+01a09e5a |
python2-PyMySQL AlmaLinux:8 | All versions | 0.8.0-10.module_el8.6.0+2781+fed64c13 |
python2-attrs AlmaLinux:8 | All versions | 17.4.0-10.module_el8.6.0+2781+fed64c13 |
python2-babel AlmaLinux:8 | All versions | 2.5.1-10.module_el8.6.0+2781+fed64c13 |
python2-backports AlmaLinux:8 | All versions | 1.0-16.module_el8.6.0+2781+fed64c13 |
python2-backports AlmaLinux:8 | All versions | 1.0-16.module_el8.6.0+3162+01a09e5a |
python2-backports-ssl_match_hostname AlmaLinux:8 | All versions | 3.5.0.1-12.module_el8.6.0+2781+fed64c13 |
python2-bson AlmaLinux:8 | All versions | 3.7.0-1.module_el8.6.0+2781+fed64c13 |
python2-bson AlmaLinux:8 | All versions | 3.7.0-1.module_el8.6.0+3162+01a09e5a |
python2-chardet AlmaLinux:8 | All versions | 3.0.4-10.module_el8.6.0+2781+fed64c13 |
python2-coverage AlmaLinux:8 | All versions | 4.5.1-4.module_el8.6.0+2781+fed64c13 |
python2-coverage AlmaLinux:8 | All versions | 4.5.1-4.module_el8.6.0+3162+01a09e5a |
python2-debug AlmaLinux:8 | All versions | 2.7.18-13.module_el8.8.0+3663+627ce7bb.2.alma.1 |
python2-devel AlmaLinux:8 | All versions | 2.7.18-13.module_el8.8.0+3663+627ce7bb.2.alma.1 |
python2-dns AlmaLinux:8 | All versions | 1.15.0-10.module_el8.6.0+2781+fed64c13 |
python2-docs AlmaLinux:8 | All versions | 2.7.16-2.module_el8.6.0+2781+fed64c13 |
python2-docs-info AlmaLinux:8 | All versions | 2.7.16-2.module_el8.6.0+2781+fed64c13 |
python2-docutils AlmaLinux:8 | All versions | 0.14-12.module_el8.6.0+2781+fed64c13 |
python2-funcsigs AlmaLinux:8 | All versions | 1.0.2-13.module_el8.6.0+2781+fed64c13 |
python2-idna AlmaLinux:8 | All versions | 2.5-7.module_el8.6.0+2781+fed64c13 |
python2-ipaddress AlmaLinux:8 | All versions | 1.0.18-6.module_el8.6.0+2781+fed64c13 |
python2-jinja2 AlmaLinux:8 | All versions | 2.10-9.module_el8.6.0+2781+fed64c13 |
python2-libs AlmaLinux:8 | All versions | 2.7.18-13.module_el8.8.0+3663+627ce7bb.2.alma.1 |
python2-lxml AlmaLinux:8 | All versions | 4.2.3-6.module_el8.6.0+2781+fed64c13 |
python2-lxml AlmaLinux:8 | All versions | 4.2.3-6.module_el8.6.0+3162+01a09e5a |
python2-markupsafe AlmaLinux:8 | All versions | 0.23-19.module_el8.6.0+2781+fed64c13 |
python2-markupsafe AlmaLinux:8 | All versions | 0.23-19.module_el8.6.0+3162+01a09e5a |
Products include Python Python.
How do I fix CVE-2023-40217?
Upgrade libpython to a fixed version for your release line: 3.8.18, 3.9.18, 3.10.13 or 3.11.5.
Is CVE-2023-40217 being exploited?
There is no known exploitation of CVE-2023-40217 in the wild and no public exploit code.
Other vulnerabilities in Python Python
Sources
Also known as ALPINE-CVE-2023-40217, ALSA-2023:5456, ALSA-2023:5462, ALSA-2023:5463, ALSA-2023:5994, ALSA-2023:5997 and 58 more.