Red Hat update for HAProxy

1) Heap-based buffer overflow

EUVDB-ID: #VU12524

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-10184

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

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

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 7.0 - 7.5

External links

http://access.redhat.com/errata/RHSA-2018:1372

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.