Link following in Sudo



Published: 2021-01-12 | Updated: 2021-01-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23240
CWE-ID CWE-59
Exploitation vector Local
Public exploit N/A
Vulnerable software
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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: #VU49884

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-23240

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

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Sudo: 1.9.0 - 1.9.4p2


CPE2.3 External links

http://bugzilla.suse.com/show_bug.cgi?id=CVE-2021-23240
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?

Is there known malware, which exploits this vulnerability?



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