#VU20371 Improper Authentication in OpenPGP.js - CVE-2019-9153
Vulnerability identifier: #VU20371
Vulnerability risk: Medium
CVSSv4.0: 7.7 [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:P/U:Green]
CVE-ID:
CWE-ID:
CWE-287
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
OpenPGP.js
Universal components / Libraries /
Libraries used by multiple products
Vendor: ProtonMail
Description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due the software does not verify the signature type during verification of a message signature. A remote attacker can send a specially crafted message with replaced signatures with a "standalone" or "timestamp" signature and forge signed messages.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
OpenPGP.js: 0.1.0 - 4.2.0
External links
https://github.com/openpgpjs/openpgpjs/pull/797/commits/327d3e5392a6f59a4270569d200c7f7a2bfc4cbc
https://github.com/openpgpjs/openpgpjs/pull/816
https://github.com/openpgpjs/openpgpjs/releases/tag/v4.2.0
https://sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-openpgp-js/
https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/Studies/Mailvelope_Extensions/Mailv...
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. However, proof of concept for this vulnerability is available.
