CVE-2023-40217

NameCVE-2023-40217
DescriptionAn 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.)
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3575-1, DLA-3614-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
pypy3 (PTS)buster7.0.0+dfsg-3vulnerable
bullseye (security), bullseye7.3.5+dfsg-2+deb11u2vulnerable
bookworm7.3.11+dfsg-2+deb12u1vulnerable
sid, trixie7.3.15+dfsg-1fixed
python2.7 (PTS)buster2.7.16-2+deb10u1vulnerable
buster (security)2.7.16-2+deb10u4fixed
bullseye2.7.18-8+deb11u1fixed
python3.11 (PTS)bookworm3.11.2-6vulnerable
trixie3.11.8-1fixed
sid3.11.9-1fixed
python3.12 (PTS)trixie3.12.2-1fixed
sid3.12.3-1fixed
python3.7 (PTS)buster3.7.3-2+deb10u3vulnerable
buster (security)3.7.3-2+deb10u7fixed
python3.9 (PTS)bullseye3.9.2-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pypy3source(unstable)7.3.13+dfsg-1
python2.7sourcebuster2.7.16-2+deb10u3DLA-3575-1
python2.7sourcebullseye2.7.18-8+deb11u1
python2.7source(unstable)(unfixed)
python3.10source(unstable)3.10.13-1
python3.11source(unstable)3.11.5-1
python3.12source(unstable)3.12.0~rc1-2
python3.7sourcebuster3.7.3-2+deb10u6DLA-3614-1
python3.7source(unstable)(unfixed)
python3.9source(unstable)(unfixed)

Notes

[bookworm] - python3.11 <no-dsa> (Minor issue)
[bullseye] - python3.9 <no-dsa> (Minor issue)
[bookworm] - pypy3 <no-dsa> (Minor issue)
[bullseye] - pypy3 <no-dsa> (Minor issue)
[buster] - pypy3 <no-dsa> (Minor issue)
https://mail.python.org/archives/list/security-announce@python.org/thread/PEPLII27KYHLF4AK3ZQGKYNCRERG4YXY/
https://github.com/python/cpython/issues/108310
https://github.com/python/cpython/pull/108315
https://github.com/python/cpython/commit/0cb0c238d520a8718e313b52cffc356a5a7561bf (main)
https://github.com/python/cpython/commit/256586ab8776e4526ca594b4866b9a3492e628f1 (3.12)
https://github.com/python/cpython/commit/75a875e0df0530b75b1470d797942f90f4a718d3 (v3.11.5)
https://github.com/python/cpython/commit/37d7180cb647f0bed0c1caab0037f3bc82e2af96 (v3.10.13)
https://github.com/python/cpython/commit/264b1dacc67346efa0933d1e63f622676e0ed96b (v3.9.18)
Additional patches to stabilize the test suite may also be applied to all versions:
1. https://github.com/python/cpython/commit/64f99350351bc46e016b2286f36ba7cd669b79e3
2. https://github.com/python/cpython/commit/592bacb6fc0833336c0453e818e9b95016e9fd47

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