Summary
The python-cryptography packages contain a Python Cryptographic Authority's (PyCA's) cryptography library, which provides cryptographic primitives and recipes to Python developers.
The following packages have been upgraded to a later upstream version: python-cryptography (3.2.1). (BZ#1873581, BZ#1891947)
Security Fix(es):
* python-cryptography: bleichenbacher timing oracle attack against RSA decryption (CVE-2020-25659)
* python-cryptography: certain sequences of update() calls when symmetrically encrypting very large payloads could result in an integer overflow and lead to buffer overflows (CVE-2020-36242)
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 Changes:
For detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Rocky Linux · 8 | python-cryptography | 0:3.2.1-4.el8 |
Vulnerabilities 2
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Critical 9.1
PyCA Cryptography symmetrically encrypting large values can lead to integer overflow
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
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Medium 5.9
RSA decryption vulnerable to Bleichenbacher timing vulnerability
python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.
References
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1778939
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1873581
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1889988
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1891947
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1907429
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1926226