#VU37877 Buffer overflow in Debian Linux - CVE-2017-16927

Vulnerability identifier: #VU37877

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2017-16927

CWE-ID: CWE-119

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 execute arbitrary code.

The scp_v0s_accept function in sesman/libscp/libscp_v0.c in the session manager in xrdp through 0.9.4 uses an untrusted integer as a write length, which allows local users to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a crafted input stream.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Debian Linux: 7.0

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External links
https://github.com/neutrinolabs/xrdp/pull/958
https://groups.google.com/forum/#!topic/xrdp-devel/PmVfMuy_xBA
https://lists.debian.org/debian-lts-announce/2017/12/msg00005.html

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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.