Use of a broken or risky cryptographic algorithm in python-rsa



| Updated: 2023-03-07
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-13757
CWE-ID CWE-327
Exploitation vector Network
Public exploit N/A
Vulnerable software
 python-rsa
Other software / Other software solutions

Vendor sybrenstuvel

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU28793

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-13757

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information on the target system.

The vulnerability exists due to the affected software does not detect ciphertext modification during decryption (prepended "0" bytes) in PKCS1_v1_5. A remote attacker gain access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

python-rsa: 4.0

CPE2.3 External links

https://github.com/sybrenstuvel/python-rsa/issues/146
https://github.com/sybrenstuvel/python-rsa/commit/93af6f2f89a9bf28361e67716c4240e691520f30


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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