Security restrictions bypass in Bubblewrap

1) Input validation error

EUVDB-ID: #VU73856

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-5226

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input. The non-privileged session can escape to the parent session by using the TIOCSTI ioctl to push characters into the terminal's input buffer, allowing an attacker to escape the sandbox.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Bubblewrap: 0.1.0 - 0.1.4

External links

http://github.com/projectatomic/bubblewrap/issues/142
http://github.com/projectatomic/bubblewrap/commit/d7fc532c42f0e9bf427923bab85433282b3e5117
http://bugzilla.redhat.com/show_bug.cgi?id=1411811
http://www.securityfocus.com/bid/97260
http://www.openwall.com/lists/oss-security/2020/07/10/1
http://www.openwall.com/lists/oss-security/2023/03/14/2
http://www.openwall.com/lists/oss-security/2023/03/17/1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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