Link following in Sudo



Published: 2021-01-12 | Updated: 2021-01-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23239
CWE-ID CWE-59
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe
Sudo
Client/Desktop applications / Software for system administration

Vendor Sudo

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Link following

EUVDB-ID: #VU49883

Risk: Low

CVSSv3.1: 2.2 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23239

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

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

The sudoedit personality of Sudo before 1.9.5 may allow a local unprivileged user to perform arbitrary directory-existence tests by winning a sudo_edit.c race condition in replacing a user-controlled directory by a symlink to an arbitrary path.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Sudo: 1.9.0 - 1.9.4p2

External links

http://bugzilla.suse.com/show_bug.cgi?id=CVE-2021-23239
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EE42Y35SMJOLONAIBNYNFC7J44UUZ2Y6/
http://www.sudo.ws/stable.html#1.9.5


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.



###SIDEBAR###