#VU7563 Out-of-bounds read in c-ares - CVE-2017-1000381

Vulnerability identifier: #VU7563

Vulnerability risk: Medium

CVSSv4.0: 6.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-1000381

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
c-ares
Universal components / Libraries / Libraries used by multiple products

Vendor: c-ares.haxx.se

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack and gain access to potentially sensitive data.

The vulnerability exists due to a boundary error in ares_parse_naptr_reply() function when processing NAPTR responses. A remote attacker can send a specially crafted DNS response to vulnerable application and perform denial of service attack or gain access to potentially sensitive data.

Mitigation
Update to version 1.13.0.

Vulnerable software versions

c-ares: 1.12.0

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External links
https://c-ares.haxx.se/adv_20170620.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.