CVE-2020-15258 Information

Description

In Wire before 3.20.x shell.openExternal was used without checking the URL. This vulnerability allows an attacker to execute code on the victims machine by sending messages containing links with arbitrary protocols. The victim has to interact with the link and sees the URL that is opened. The issue was patched by implementing a helper function which checks if the URL’s protocol is common. If it is common the URL will be opened externally. If not the URL will not be opened and a warning appears for the user informing them that a probably insecure URL was blocked from being executed. The issue is patched in Wire 3.20.x. More technical details about exploitation are available in the linked advisory.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Reference

https://benjamin-altpeter.de/shell-openexternal-dangers/ https://github.com/wireapp/wire-desktop/commit/b3705fffa75a03f055530f55a754face5ac0623b https://github.com/wireapp/wire-desktop/security/advisories/GHSA-5gpx-9976-ggpm

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.0