#VU16958 Out-of-bounds read in BusyBox - CVE-2018-20679

Vulnerability identifier: #VU16958

Vulnerability risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-20679

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BusyBox
Universal components / Libraries / Software for developers

Vendor: busybox.net

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in udhcp components (consumed by the DHCP server, client, and relay). A remote attacker can leak sensitive information from the stack by sending a crafted DHCP message.

Mitigation
Update to version 1.30.0.

Vulnerable software versions

BusyBox: 1.28.0 - 1.29.3

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External links
https://bugs.busybox.net/show_bug.cgi?id=11506
https://busybox.net/news.html
https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c

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