Security restrictions bypass in snapd



| Updated: 2020-01-29
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-11503
CWE-ID CWE-362
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Snapd
Universal components / Libraries / Software for developers

Vendor snapcore

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 04.05.2019

Changed bulletin status to patched.

1) Race condition

EUVDB-ID: #VU18375

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-11503

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition when processing symlinks using the chdir() function to restore a working directory. A local user can run snap-confine on a specially crafted symlink and restore files without necessary permissions. 

Mitigation

Install update from vendor's website.

Vulnerable software versions

Snapd: 2.0 - 2.38.1

CPE2.3 External links

https://www.openwall.com/lists/oss-security/2019/04/25/7
https://github.com/snapcore/snapd/pull/6642
https://www.openwall.com/lists/oss-security/2019/04/18/4


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.



###SIDEBAR###