Denial of service in linux-firmware (Alpine package)

1) Denial of service

EUVDB-ID: #VU6435

Risk: Medium

CVSSv4.0: 8.7 [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:A/U:Green]

CVE-ID: CVE-2017-8779

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error in xdr_bytes() and xdr_string() functions when processing RPC data during memory allocation within rpcbind implementation. A remote unauthenticated attacker can send a specially crafted UDP request to port 111 and consume up to 4 gigabytes of memory per request.

Successful exploitation of this vulnerability may result in denial of service (DoS) conditions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

linux-firmware (Alpine package): All versions

CPE2.3

• cpe:2.3:a:alpine:linux-firmware_alpine_package:*:*:*:*:*:alpine_linux:*:3.8

External links

https://git.alpinelinux.org/aports/commit/?id=07b9652003eee6c334b9e37f189ab59c2a6617a3
https://git.alpinelinux.org/aports/commit/?id=bdaa9eb015d20e4539353d48dc00a624bfb2797c
https://git.alpinelinux.org/aports/commit/?id=d2bfb22c8e8f67ad7d8d02704f35ec4d2a19f9b9
https://git.alpinelinux.org/aports/commit/?id=19ae9575a3b6ad8c7de8402b0926e36b51582544

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. However, a fully functional exploit for this vulnerability is available.