openEuler update for sudo



Published: 2021-01-28
Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-3156
CVE-2021-23239
CVE-2021-23240
CWE-ID CWE-122
CWE-59
Exploitation vector Local
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
Subscribe 		openEuler
Operating systems & Components / Operating system

sudo-help
Operating systems & Components / Operating system package or component

sudo-devel
Operating systems & Components / Operating system package or component

sudo-debugsource
Operating systems & Components / Operating system package or component

sudo-debuginfo
Operating systems & Components / Operating system package or component

sudo
Operating systems & Components / Operating system package or component

Vendor openEuler

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Heap-based buffer overflow

EUVDB-ID: #VU50040

Risk: Low

CVSSv3.1: 7.5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-3156

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in sudo. A local user can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system with root privileges.


Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS - 20.03 LTS SP1

sudo-help: before 1.9.2-2

sudo-devel: before 1.9.2-2

sudo-debugsource: before 1.9.2-2

sudo-debuginfo: before 1.9.2-2

sudo: before 1.9.2-2

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1002


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?

Yes. This vulnerability is being exploited in the wild.

2) 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 updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS - 20.03 LTS SP1

sudo-help: before 1.9.2-2

sudo-devel: before 1.9.2-2

sudo-debugsource: before 1.9.2-2

sudo-debuginfo: before 1.9.2-2

sudo: before 1.9.2-2

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1002


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.

3) Link following

EUVDB-ID: #VU49884

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

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 updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS - 20.03 LTS SP1

sudo-help: before 1.9.2-2

sudo-devel: before 1.9.2-2

sudo-debugsource: before 1.9.2-2

sudo-debuginfo: before 1.9.2-2

sudo: before 1.9.2-2

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1002


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.



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