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Red Hat Security Advisory 2023-7096-01
Red Hat Security Advisory 2023-7096-01 - An update for python-cryptography is now available for Red Hat Enterprise Linux 8.
The following data is constructed from data provided by Red Hat's json file at:https://access.redhat.com/security/data/csaf/v2/advisories/2023/rhsa-2023_7096.jsonRed Hat officially shut down their mailing list notifications October 10, 2023. Due to this, Packet Storm has recreated the below data as a reference point to raise awareness. It must be noted that due to an inability to easily track revision updates without crawling Red Hat's archive, these advisories are single notifications and we strongly suggest that you visit the Red Hat provided links to ensure you have the latest information available if the subject matter listed pertains to your environment.- Packet Storm Staff====================================================================Red Hat Security AdvisorySynopsis: Moderate: python-cryptography security updateAdvisory ID: RHSA-2023:7096-01Product: Red Hat Enterprise LinuxAdvisory URL: https://access.redhat.com/errata/RHSA-2023:7096Issue date: 2023-11-14Revision: 01CVE Names: CVE-2023-23931====================================================================Summary: An update for python-cryptography is now available for Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.Description:The python-cryptography packages contain a Python Cryptographic Authority's (PyCA's) cryptography library, which provides cryptographic primitives and recipes to Python developers.Security Fix(es):* python-cryptography: memory corruption via immutable objects (CVE-2023-23931)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 Red Hat Enterprise Linux 8.9 Release Notes linked from the References section.Solution:https://access.redhat.com/articles/11258CVEs:CVE-2023-23931References:https://access.redhat.com/security/updates/classification/#moderatehttps://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.9_release_notes/indexhttps://bugzilla.redhat.com/show_bug.cgi?id=2171817https://bugzilla.redhat.com/show_bug.cgi?id=2172404
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cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.
Previously, `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers: ```pycon >>> outbuf = b"\x00" * 32 >>> c = ciphers.Cipher(AES(b"\x00" * 32), modes.ECB()).encryptor() >>> c.update_into(b"\x00" * 16, outbuf) 16 >>> outbuf b'\xdc\x95\xc0x\xa2@\x89\x89\xadH\xa2\x14\x92\x84 \x87\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' ``` This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python. This is a soundness bug -- it allows programmers to misuse an API, it cannot be exploited by attacker controlled data alone. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.