#VU10323 Resource exhaustion in libtASN1 - CVE-2018-6003

Vulnerability identifier: #VU10323

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-6003

CWE-ID: CWE-400

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 cause DoS condition on the target system.

The weakness exists in the _asn1_decode_simple_ber function in decoding.c in GNU Libtasn1. A remote attacker can trigger unlimited recursion in the BER decoder and stack exhaustion to cause the service to crash.

Mitigation
Update to version 4.13 or later.

Vulnerable software versions

libtASN1: 4.0 - 4.12

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External links
https://git.savannah.nongnu.org/cgit/libtasn1.git/commit/?id=c593ae84cfcde8fea45787e53950e0ac71e9ca97

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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.