#VU11858 NULL pointer dereference in nghttp2 - CVE-2018-1000168

Vulnerability identifier: #VU11858

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-1000168

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
nghttp2
Universal components / Libraries / Libraries used by multiple products

Vendor: nghttp2

Description

The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists due to improper bounds checking. If an alternative services (ALTSVC) frame is too large, the pointer field that points to the ALTSVC frame payload is left NULL. A remote attacker can submit a large ALTSVC frame, trigger a NULL pointer dereference and cause the service to crash.

Mitigation
Update to version 1.31.1.

Vulnerable software versions

nghttp2: 1.10.0 - 1.31.0

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External links
https://nghttp2.org/blog/2018/04/12/nghttp2-v1-31-1/

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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.