openEuler update for kernel



Published: 2021-07-31
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-33909
CWE-ID CWE-190
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		openEuler
Operating systems & Components / Operating system

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

kernel-tools-devel
Operating systems & Components / Operating system package or component

python2-perf
Operating systems & Components / Operating system package or component

python3-perf
Operating systems & Components / Operating system package or component

kernel-tools-debuginfo
Operating systems & Components / Operating system package or component

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

bpftool
Operating systems & Components / Operating system package or component

kernel-tools
Operating systems & Components / Operating system package or component

perf
Operating systems & Components / Operating system package or component

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

python2-perf-debuginfo
Operating systems & Components / Operating system package or component

kernel-source
Operating systems & Components / Operating system package or component

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

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

python3-perf-debuginfo
Operating systems & Components / Operating system package or component

kernel
Operating systems & Components / Operating system package or component

Vendor openEuler

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Integer overflow

EUVDB-ID: #VU55143

Risk: Low

CVSSv3.1: 7.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-33909

CWE-ID: CWE-190 - Integer overflow

Exploit availability: Yes

Description

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

The vulnerability exists due to integer overflow during size_t-to-int conversion when creating, mounting, and deleting a deep directory structure whose total path length exceeds 1GB. An unprivileged local user can write up to 10-byte string to an offset of exactly -2GB-10B below the beginning of a vmalloc()ated kernel buffer.

Successful exploitation of vulnerability may allow an attacker to exploit the our-of-bounds write vulnerability to execute arbitrary code with root privileges.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1 - 20.03 LTS SP2

bpftool-debuginfo: before 4.19.90-2107.5.0.0098

kernel-tools-devel: before 4.19.90-2107.5.0.0098

python2-perf: before 4.19.90-2107.5.0.0098

python3-perf: before 4.19.90-2107.5.0.0098

kernel-tools-debuginfo: before 4.19.90-2107.5.0.0098

kernel-debuginfo: before 4.19.90-2107.5.0.0098

bpftool: before 4.19.90-2107.5.0.0098

kernel-tools: before 4.19.90-2107.5.0.0098

perf: before 4.19.90-2107.5.0.0098

kernel-debugsource: before 4.19.90-2107.5.0.0098

python2-perf-debuginfo: before 4.19.90-2107.5.0.0098

kernel-source: before 4.19.90-2107.5.0.0098

perf-debuginfo: before 4.19.90-2107.5.0.0098

kernel-devel: before 4.19.90-2107.5.0.0098

python3-perf-debuginfo: before 4.19.90-2107.5.0.0098

kernel: before 4.19.90-2107.5.0.0098

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1293


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. However, proof of concept for this vulnerability is available.



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