#VU21329 Out-of-bounds write in E2fsprogs - CVE-2019-5094

Vulnerability identifier: #VU21329

Vulnerability risk: Low

CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-5094

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
E2fsprogs
Universal components / Libraries / Libraries used by multiple products

Vendor: e2fsprogs.sourceforge.net

Description

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

The vulnerability exists due to a boundary error when processing untrusted input in the quota file functionality. A local user can send a specially crafted xt4 partition, trigger out-of-bounds write on the heap and execute arbitrary code on the target system.

Note: An attacker can corrupt a partition to trigger this vulnerability.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

E2fsprogs: 1.43.3 - 1.45.3

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External links
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0887

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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.