Integer overflow in libvncserver (Alpine package)

1) Integer overflow

EUVDB-ID: #VU11221

Risk: Low

CVSSv4.0: 2.7 [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:U/U:Clear]

CVE-ID: CVE-2018-7225

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The weakness exists in the rfbProcessClientNormalMessage() function due to integer overflow. A remote attacker can trigger memory corruption and gain access to potentially sensitive information.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libvncserver (Alpine package): 0.9.10-r0 - 0.9.11-r1

CPE2.3

• cpe:2.3:o:alpine:libvncserver_alpine_package:0.9.10-r0:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:o:alpine:libvncserver_alpine_package:0.9.10-r1:*:*:*:*:alpine_linux:*:3.1
• cpe:2.3:o:alpine:libvncserver_alpine_package:0.9.10-r2:*:*:*:*:alpine_linux:*:3.1

External links

https://git.alpinelinux.org/aports/commit/?id=7f993019c4f6466e8d8dc2063699f749eedba865
https://git.alpinelinux.org/aports/commit/?id=bf1ec813f662f128fc6b70f37ef1c0474bb24488
https://git.alpinelinux.org/aports/commit/?id=e3a33d48d59a183072d3ee0da1298f28fc3f2f11
https://git.alpinelinux.org/aports/commit/?id=22306ce240e5b8a0067c806bb73235f72ad3f81d
https://git.alpinelinux.org/aports/commit/?id=8cb1ee23b7bc0d719ec7229ba43bf47891d68dbf
https://git.alpinelinux.org/aports/commit/?id=ef8044ed82008b70d1e6fc86b340d60d3c0d16a0

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.