Vulnerability identifier: #VU11162

Vulnerability risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-16229

CWE-ID: CWE-126

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Optimized XML
Server applications / File servers (FTP/HTTP)

Vendor: Ruby

Description
The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the read_from_str function due to stack-based buffer overread. A local attacker can send specially crafted input to be parsed by the sax_parse function, trigger memory corruption and cause the service to crash.

Mitigation
Update to version 2.8.2.

Vulnerable software versions

Optimized XML: 2.8.1

---

External links
http://github.com/ohler55/ox/issues/195

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.