Vulnerability identifier: #VU10570

Vulnerability risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PyBitmessage
Client/Desktop applications / Messaging software

Vendor: Bitmessage

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to a message encoding bug. A remote attacker can send a specially crafted message, run an automated script looking in ~/.electrum/wallets, open a remote reverse shell, gain access to other files and execute arbitrary code.

Successful exploitation of the vulnerability results in system compromise.

Note: the vulnerability has been actively exploited to create a remote shell and steal bitcoins from Electrum wallets.

Mitigation
Update to version 0.6.3.2.

Vulnerable software versions

PyBitmessage: 0.6.2

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External links
http://bitmessage.org/wiki/Main_Page
http://www.reddit.com/r/bitmessage/comments/7xaplc/in_case_you_didnt_notice_update_pybm_right_now/

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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?

Yes. This vulnerability is being exploited in the wild.