openEuler 20.03 LTS update for kernel

1) Use-after-free

EUVDB-ID: #VU56393

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-2021-3715

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem (route4_change() function in net/sched/cls_route.c) in the way it handled changing of classification filters. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS

bpftool-debuginfo: before 4.19.90-2009.3.0.0045

bpftool: before 4.19.90-2009.3.0.0045

python3-perf-debuginfo: before 4.19.90-2009.3.0.0045

python3-perf: before 4.19.90-2009.3.0.0045

python2-perf-debuginfo: before 4.19.90-2009.3.0.0045

python2-perf: before 4.19.90-2009.3.0.0045

perf-debuginfo: before 4.19.90-2009.3.0.0045

perf: before 4.19.90-2009.3.0.0045

kernel-tools-devel: before 4.19.90-2009.3.0.0045

kernel-tools-debuginfo: before 4.19.90-2009.3.0.0045

kernel-tools: before 4.19.90-2009.3.0.0045

kernel-source: before 4.19.90-2009.3.0.0045

kernel-devel: before 4.19.90-2009.3.0.0045

kernel-debugsource: before 4.19.90-2009.3.0.0045

kernel-debuginfo: before 4.19.90-2009.3.0.0045

kernel: before 4.19.90-2009.3.0.0045

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1341

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.