Ubuntu update for linux

Published: 2021-11-09

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-29660 CVE-2020-29661
CWE-ID	CWE-667
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system linux-image-virtual (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-server (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-3.13.0-188-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-3.13.0-188-generic (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper locking

EUVDB-ID: #VU57039

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-29660

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to double-locking error in drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c. An authenticated local user can exploit this vulnerability to perform a read-after-free attack against TIOCGSID and gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04

linux-image-virtual (Ubuntu package): before 3.13.0188.239

linux-image-server (Ubuntu package): before 3.13.0188.239

linux-image-lowlatency (Ubuntu package): before 3.13.0188.239

linux-image-generic (Ubuntu package): before 3.13.0188.239

linux-image-3.13.0-188-lowlatency (Ubuntu package): before 3.13.0188.239

linux-image-3.13.0-188-generic (Ubuntu package): before 3.13.0188.239

External links

http://ubuntu.com/security/notices/USN-5130-1

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.

2) Improper locking

EUVDB-ID: #VU51543