#VU12524 Heap-based buffer overflow in HAProxy - CVE-2018-10184

Vulnerability identifier: #VU12524

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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:U/U:Green]

CVE-ID: CVE-2018-10184

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
HAProxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: HAProxy

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

The weakness exists in the mux_h2.c source code file due to improper H2 frame length checking. The H2 frame length is checked against the max_frame_size setting instead of being checked against the bufsize. A remote attacker can send a request that submits a large H2 frame, trigger heap-based buffer overflow and cause the service to crash.

Mitigation
Update to version 1.8.8.

Vulnerable software versions

HAProxy: 1.8.0 - 1.8.7

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External links
https://git.haproxy.org/?p=haproxy-1.8.git&a=commit&h=cd117685f0cff4f2f5577ef6a21eaae...

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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.