Vulnerability Details : CVE-2020-36242
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.
Vulnerability category: Overflow
Products affected by CVE-2020-36242
- Oracle » Communications Cloud Native Core Network Function Cloud Native Environment » Version: 1.10.0cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-36242
0.85%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 80 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-36242
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
6.4
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:P |
10.0
|
4.9
|
NIST | |
9.1
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
3.9
|
5.2
|
NIST |
CWE ids for CVE-2020-36242
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by: nvd@nist.gov (Primary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-36242
-
https://www.oracle.com/security-alerts/cpuapr2022.html
Oracle Critical Patch Update Advisory - April 2022Patch;Third Party Advisory
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https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
Comparing 3.3.1...3.3.2 · pyca/cryptography · GitHubPatch;Third Party Advisory
-
https://github.com/pyca/cryptography/issues/5615
Fernet fails to encrypt/decrypt large data · Issue #5615 · pyca/cryptography · GitHubExploit;Patch;Third Party Advisory
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https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
cryptography/CHANGELOG.rst at master · pyca/cryptography · GitHubRelease Notes;Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
[SECURITY] Fedora 33 Update: python-cryptography-3.2.1-2.fc33 - package-announce - Fedora Mailing-Lists
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
[SECURITY] Fedora 33 Update: python-cryptography-3.2.1-2.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://www.oracle.com/security-alerts/cpujul2022.html
Oracle Critical Patch Update Advisory - July 2022Patch;Third Party Advisory
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