Out-of-bounds read in busybox (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU17679

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-8791

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The vulnerability exists due to an out-of-bounds read condition in the rdpdr_process() function. A remote attacker can trick the victim who is using a Remote Desktop Protocol (RDP) client on a targeted system into connecting to an attacker-controlled RDP server, trigger segmentation fault (segfault) and access sensitive information on the targeted system. 

Mitigation

Install update from vendor's website.

Vulnerable software versions

busybox (Alpine package): 1.31.1-r16 - 1.31.1-r21

busybox (Alpine package):

CPE2.3

• cpe:2.3:o:alpine:busybox_alpine_package:1.31.1-r17:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:busybox_alpine_package:1.31.1-r18:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:busybox_alpine_package:1.31.1-r19:*:*:*:*:alpine_linux:*:
• cpe:2.3:o:alpine:busybox_alpine_package::*:*:*:*:alpine_linux:*:

External links

http://git.alpinelinux.org/aports/commit/?id=76077dfdd8d77220a469c5743b7b7fd3484300a1

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.