Buffer over-read in nginx (Alpine package)

1) Buffer over-read

EUVDB-ID: #VU15743

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-16845

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or trigger denial of service conditions.

The vulnerability exists due to a boundary condition when processing headers of MP4 files within the ngx_http_mp4_module module. A remote attacker can create a specially crafted MP4 file, trick the victim into uploading it on the server and trigger application crash or disclosure of the worker's process memory.

Successful exploitation of the vulnerability requires that nginx is compiled with support for ngx_http_mp4_module module (not a default configuration).

Mitigation

Install update from vendor's website.

Vulnerable software versions

nginx (Alpine package): 1.0.15-r0 - 1.12.2-r1

External links

http://git.alpinelinux.org/aports/commit/?id=820edddd99fb21127b48d61ab5bcf8705d1b03b6
http://git.alpinelinux.org/aports/commit/?id=e86a2a9f72ca3473b25cd7ae7085d79c368615b0
http://git.alpinelinux.org/aports/commit/?id=6b75c937d616093cfc19f88eb23252e393cc3307
http://git.alpinelinux.org/aports/commit/?id=e104e0f441e5234364ca25e6467d1b1e30766f17

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.