Vulnerability-Lookup

RHSA-2021:1608

Vulnerability from csaf_redhat - Published: 2021-05-18 15:21 - Updated: 2026-11-06 04:42

Summary

Red Hat Security Advisory: python-cryptography security, bug fix, and enhancement update

Severity

Moderate

Notes

Topic: 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.

Details: 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 Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2020-25659

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.

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE-385 - Covert Timing Channel

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: BaseOS-8.4.0.GA:python-cryptography-0:3.2.1-4.el8.src	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python-cryptography-debugsource-0:3.2.1-4.el8.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python-cryptography-debugsource-0:3.2.1-4.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python-cryptography-debugsource-0:3.2.1-4.el8.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python-cryptography-debugsource-0:3.2.1-4.el8.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-0:3.2.1-4.el8.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-0:3.2.1-4.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-0:3.2.1-4.el8.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-0:3.2.1-4.el8.x86_64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-debuginfo-0:3.2.1-4.el8.aarch64	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-debuginfo-0:3.2.1-4.el8.ppc64le	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-debuginfo-0:3.2.1-4.el8.s390x	—	Vendor Fix fix
Unresolved product id: BaseOS-8.4.0.GA:python3-cryptography-debuginfo-0:3.2.1-4.el8.x86_64	—	Vendor Fix fix

Threats

Impact Moderate

CVE-2020-36242

A buffer-overflow flaw was found in the python-cryptography package. In certain sequences of ``update()`` calls when symmetrically encrypting very large payloads (>2GB) could result in an integer overflow, leading to buffer overflows. Note: This fix is a workaround for the OpenSSL CVE-2021-23840 flaw. Source: pyca/cryptography project

8.2 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CWE-190 - Integer Overflow or Wraparound

Affected products

Fixed 13 products, the same list as for CVE-2020-25659

Threats

Impact Moderate

References

20 references

URL	Category
https://access.redhat.com/errata/RHSA-2021:1608	self
https://access.redhat.com/security/updates/classi…	external
https://access.redhat.com/documentation/en-us/red…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1778939	external
https://bugzilla.redhat.com/show_bug.cgi?id=1873581	external
https://bugzilla.redhat.com/show_bug.cgi?id=1889988	external
https://bugzilla.redhat.com/show_bug.cgi?id=1891947	external
https://bugzilla.redhat.com/show_bug.cgi?id=1907429	external
https://bugzilla.redhat.com/show_bug.cgi?id=1926226	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2020-25659	self
https://bugzilla.redhat.com/show_bug.cgi?id=1889988	external
https://www.cve.org/CVERecord?id=CVE-2020-25659	external
https://nvd.nist.gov/vuln/detail/CVE-2020-25659	external
https://cryptography.io/en/latest/changelog.html#v3-2	external
https://access.redhat.com/security/cve/CVE-2020-36242	self
https://bugzilla.redhat.com/show_bug.cgi?id=1926226	external
https://www.cve.org/CVERecord?id=CVE-2020-36242	external
https://nvd.nist.gov/vuln/detail/CVE-2020-36242	external
https://cryptography.io/en/latest/changelog.html#v3-3-2	external

Acknowledgments

Red Hat Hubert Kario

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}

CVE-2020-25659 (GCVE-0-2020-25659)

Vulnerability from cvelistv5 – Published: 2021-01-11 15:37 – Updated: 2024-08-04 15:40

Summary

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.

Severity

No CVSS data available.

CWE

CWE-385

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1206 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/pyca/cryptography/pull/5507/co…	x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	python-cryptography	Affected: python-cryptography 3.2

Show details on NVD website

JSON

To clipboard

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CVE-2020-36242 (GCVE-0-2020-36242)

Vulnerability from cvelistv5 – Published: 2021-02-07 19:50 – Updated: 2024-08-04 17:23

Summary

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.

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2158 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/pyca/cryptography/issues/5615	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://github.com/pyca/cryptography/compare/3.3.…	x_refsource_CONFIRM
https://github.com/pyca/cryptography/blob/master/…	x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpujul2022.html	x_refsource_MISC

Show details on NVD website

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To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2021:1608

CVE-2020-25659 (GCVE-0-2020-25659)

CVE-2020-36242 (GCVE-0-2020-36242)

Tags

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Nomenclature

Vulnerability timeline

Related by attack behaviour