#VU18290 Input validation error in libtASN1 - CVE-2018-1000654

Vulnerability identifier: #VU18290

Vulnerability risk: Low

CVSSv4.0: 5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-1000654

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libtASN1
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

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: 4.0 - 4.14

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External links
https://www.securityfocus.com/bid/105151
https://gitlab.com/gnutls/libtasn1/issues/4
https://gitlab.com/gnutls/libtasn1/-/merge_requests/11

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?