Buffer overflow in musl (Alpine package)

1) Buffer overflow

EUVDB-ID: #VU27338

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-15650

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary when processing DNS replies in dns_parse_callback(0 function in network/lookup_name.c. A remote attacker can send an unexpected number by sending A records in a reply to an AAAA query, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

musl (Alpine package): 1.1.11-r4

External links

http://git.alpinelinux.org/aports/commit/?id=4e5130b47a0ced3613bc1d8abf615d91c27800de
http://git.alpinelinux.org/aports/commit/?id=83cdd9d4a4daa66a2b19930af1f5bd6cfb5ea6eb
http://git.alpinelinux.org/aports/commit/?id=c5ed73ea9b77dba08b343ca203149474d11e9c51
http://git.alpinelinux.org/aports/commit/?id=ee51f150de283e11fbf83aec8aadcdd8e2a0900e
http://git.alpinelinux.org/aports/commit/?id=f1e1f5ef9da08c15051e7de6d6efbc8ce7ded765

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.