Input validation error in libtasn1 (Alpine package)

1) Input validation error

EUVDB-ID: #VU18290

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-1000654

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input within the _asn1_expand_object_id(p_tree) function when parsing a specially crafted file with asn1Parser binary. An attacker can create a specially crafted file, pass it to the application and consume all available CPU resources on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libtasn1 (Alpine package): 4.2-r0 - 4.13-r0

External links

http://git.alpinelinux.org/aports/commit/?id=5e3a0aede429cc681fb71653cd4544284ceb58f7
http://git.alpinelinux.org/aports/commit/?id=69f938f4250b0ba60b9ee4e57d42325791fa0cda
http://git.alpinelinux.org/aports/commit/?id=a17a05c052b39180e5e9ca9198ab8756ba0fc0aa
http://git.alpinelinux.org/aports/commit/?id=b2bb01e5559952d7c2535629e34c5a46a8c2b4ff
http://git.alpinelinux.org/aports/commit/?id=516129f7e77b1c7def4f3d8aa08d8673e4c4d69f

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, proof of concept for this vulnerability is available.