Remote code execution in systemd

1) Out-of-bounds write

EUVDB-ID: #VU7219

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-9445

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when processing DNS responses in systemd-resolved. A remote unauthenticated attacker can send a specially crafted DNS response, trigger out-of-bounds write and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

The vulnerability is addressed in the following versions:
233-10.

Vulnerable software versions

systemd: 223 - 233

CPE2.3

• cpe:2.3:a:freedesktop_org:systemd:223:*:*:*:*:*:*:*
• cpe:2.3:a:freedesktop_org:systemd:224:*:*:*:*:*:*:*
• cpe:2.3:a:freedesktop_org:systemd:225:*:*:*:*:*:*:*

External links

https://github.com/systemd/systemd/commit/262d95fecd357343887709006188f690cfe040a9
https://github.com/systemd/systemd/pull/6020

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.