#VU27904 Use-after-free in iproute2 - CVE-2019-20795

Vulnerability identifier: #VU27904

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-20795

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
iproute2
Universal components / Libraries / Libraries used by multiple products

Vendor: Stephen Hemminger

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the get_netnsid_from_name() function in ip/ipnetns.c. A remote attacker can send specially crafted data to the application, trigger use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

iproute2: 4.0.0 - 5.0.0

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External links
https://bugzilla.suse.com/show_bug.cgi?id=1171452
https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9bf2c538a0eb10d66e2365a655bf6c52f5ba3d10

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.