#VU33449 Out-of-bounds read in Debian Linux - CVE-2018-20175

Vulnerability identifier: #VU33449

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-20175

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Debian Linux
Operating systems & Components / Operating system

Vendor: Debian

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

rdesktop versions up to and including v1.8.3 contains several Integer Signedness errors that lead to Out-Of-Bounds Reads in the file mcs.c and result in a Denial of Service (segfault).

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 8.0 - 9.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-09/msg00040.html
https://www.securityfocus.com/bid/106938
https://github.com/rdesktop/rdesktop/commit/4dca546d04321a610c1835010b5dad85163b65e1
https://lists.debian.org/debian-lts-announce/2019/02/msg00030.html
https://research.checkpoint.com/reverse-rdp-attack-code-execution-on-rdp-clients/
https://security.gentoo.org/glsa/201903-06
https://www.debian.org/security/2019/dsa-4394

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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.