Out-of-bounds write in freerdp (Alpine package)

1) Out-of-bounds write

EUVDB-ID: #VU16589

Risk: High

CVSSv4.0: 7.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-8788

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

Exploit availability: Yes

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition or execute arbitrary code.

The vulnerability exists due to out-of-bounds write condition in the nsc_rle_decode() function, as defined in the nsc.c source code file. A remote attacker can send a specially crafted request that submits malicious input, trigger a heap-based buffer overflow condition that the attacker can use to cause a DoS condition or execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Install update from vendor's website.

Vulnerable software versions

freerdp (Alpine package): 2.0.0_rc3-r1

CPE2.3

• cpe:2.3:o:alpine:freerdp_alpine_package:2.0.0_rc3-r1:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=e661f5459886e6e7cc6c5562633ab99aa4a38101
https://git.alpinelinux.org/aports/commit/?id=0711692c669f13dd536c845cb15cb205c9e88d12

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.