#VU15783 Resource exhaustion in pyopenssl - CVE-2018-1000808

Vulnerability identifier: #VU15783

Vulnerability risk: Low

CVSSv4.0: 6.6 [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:U/U:Clear]

CVE-ID: CVE-2018-1000808

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pyopenssl
Client/Desktop applications / Other client software

Vendor: Python Cryptographic Authority

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to improper release of memory before removing the last reference in a Public Key Cryptography Standards (PKCS) #12 store. A remote unauthenticated attacker can send a specially crafted request that submits malicious input, exhaust memory resources and to cause the application to reload certificates from a PKCS #12 store.

Mitigation
Update to version 17.5.0.

Vulnerable software versions

pyopenssl: 0.1 - 17.4

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External links
https://github.com/pyca/pyopenssl/pull/723

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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.