Covert Timing Channel in py3-cryptography (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-25659
CWE-ID CWE-385
Exploitation vector Network
Public exploit N/A
Vulnerable software
 py3-cryptography (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Covert Timing Channel

EUVDB-ID: #VU50367

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-25659

CWE-ID: CWE-385 - Covert Timing Channel

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

py3-cryptography (Alpine package): 2.9.2-r0 - 3.3.1-r0

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=e691a3a7e646322c6d81ce133627c514dac0c897
https://git.alpinelinux.org/aports/commit/?id=9c0acaacd12032444c9d39ceba481c3f30d8863d


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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