Bug 1889988 (CVE-2020-25659)
| Summary: | CVE-2020-25659 python-cryptography: Bleichenbacher timing oracle attack against RSA decryption | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Huzaifa S. Sidhpurwala <huzaifas> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | akarol, apevec, bcoca, cheimes, chousekn, cmeyers, davidn, dbecker, dfediuck, dmetzger, eedri, gblomqui, gmccullo, gtanzill, hhorak, hkario, jcammara, jfrey, jhardy, jjoyce, jobarker, jorton, jschluet, lhh, lpeer, mabashia, mburns, mgoldboi, michal.skrivanek, notting, osapryki, python-maint, relrod, rhos-maint, roliveri, sbonazzo, sclewis, sdoran, security-response-team, sherold, simaishi, slinaber, smallamp, smcdonal, tkuratom |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | python-cryptography 3.2 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A flaw was found in python-cryptography, where it is vulnerable to Bleichenbacher timing attacks. This flaw allows an attacker, via the RSA decryption API, to decrypt parts of the ciphertext encrypted with RSA. The highest threat from this vulnerability is to confidentiality.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-05-18 20:36:49 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1873581, 1927616, 1927617, 1927618, 1927619, 1928183, 1929131, 1929461, 1929462, 1935588, 1935589, 1935590, 1969515, 2153471 | ||
| Bug Blocks: | 1889989 | ||
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Description
Huzaifa S. Sidhpurwala
2020-10-21 07:29:56 UTC
Upstream commit: https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b Acknowledgments: Name: Hubert Kario (Red Hat) The upstream patch in python-cryptography >= 3.2 is only a partial mitigation against Bleichenbacher attacks.
Quote from upstream changelog:
**SECURITY ISSUE:** Attempted to make RSA PKCS#1v1.5 decryption more constant
time, to protect against Bleichenbacher vulnerabilities. Due to limitations
imposed by our API, we cannot completely mitigate this vulnerability and a
future release will contain a new API which is designed to be resilient to
these for contexts where it is required. Credit to **Hubert Kario** for
reporting the issue. *CVE-2020-25659*
RHEL 8.4 and newer have a recent version of python-cryptography with partial mitigation. RHBZ #1873581 is the rebase ticket for update to 3.2.1.
CloudForms stopped shipping python-cryptography 5.11 (5.0) onward. Support for 5.10 (4.7) is EOL from February 7, 2021. Please refer CloudForms Lifecycle page for more information: https://access.redhat.com/support/policy/updates/cloudforms External References: https://cryptography.io/en/latest/changelog.html#v3-2 Created python-cryptography tracking bugs for this issue: Affects: openstack-rdo [bug 1929462] Statement: In Red Hat OpenStack Platform, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP python-cryptography package. This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:1608 https://access.redhat.com/errata/RHSA-2021:1608 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-25659 This issue has been addressed in the following products: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 Via RHSA-2021:2239 https://access.redhat.com/errata/RHSA-2021:2239 This issue has been addressed in the following products: Red Hat Software Collections for Red Hat Enterprise Linux 7 Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS Via RHSA-2021:3254 https://access.redhat.com/errata/RHSA-2021:3254 |