Vulnerability Details : CVE-2020-13757
Potential exploit
Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).
Products affected by CVE-2020-13757
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:a:python-rsa_project:python-rsa:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-13757
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 22 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-13757
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2020-13757
-
The product uses a broken or risky cryptographic algorithm or protocol.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-13757
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2KILTHBHNSDUCYV22ODLOKTICJJ7JQIQ/
[SECURITY] Fedora 31 Update: python-rsa-3.4.2-15.fc31 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/sybrenstuvel/python-rsa/issues/146#issuecomment-641845667
python-rsa does not detect ciphertext modification (prepended "0" bytes) in PKCS1_v1_5 · Issue #146 · sybrenstuvel/python-rsa · GitHubExploit;Issue Tracking;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZYB65VNILRBTXL6EITQTH2PZPK7I23MW/
[SECURITY] Fedora 32 Update: python-rsa-3.4.2-15.fc32 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4478-1/
USN-4478-1: Python-RSA vulnerability | Ubuntu security notices | UbuntuThird Party Advisory
-
https://github.com/sybrenstuvel/python-rsa/issues/146
python-rsa does not detect ciphertext modification (prepended "0" bytes) in PKCS1_v1_5 · Issue #146 · sybrenstuvel/python-rsa · GitHubIssue Tracking;Third Party Advisory
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