#VU17119 Out-of-bounds read in uriparser - CVE-2018-20721

Vulnerability identifier: #VU17119

Vulnerability risk: Low

CVSSv4.0: 7.7 [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:P/U:Clear]

CVE-ID: CVE-2018-20721

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
uriparser
Universal components / Libraries / Libraries used by multiple products

Vendor: uriparser

Description

The vulnerability allows a remote attacker to gain access to cause DoS condition.

The vulnerability exists in URI_FUNC() in UriParse.c in uriparser due to a boundary condition. A remote attacker can create a specially crafted Excel file, trick the victim into opening it, trigger out-of-bounds read error for an incomplete URI with an IPv6 address containing an embedded IPv4 address, such as a "//[::44.1" address and cause the service to crash.

Mitigation
Update to version 0.9.1.

Vulnerable software versions

uriparser: 0.3 - 0.9

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External links
https://github.com/uriparser/uriparser/blob/master/ChangeLog
https://github.com/uriparser/uriparser/commit/cef25028de5ff872c2e1f0a6c562eb3ea9ecbce4

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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. However, proof of concept for this vulnerability is available.