Multiple vulnerabilities in Python Cryptographic Authority pyopenssl

Published: 2017-10-29

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-1000808 CVE-2018-1000807
CWE-ID	CWE-400 CWE-416
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	pyopenssl Client/Desktop applications / Other client software
Vendor	Python Cryptographic Authority

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU15783

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 - Resource exhaustion

Exploit availability: No

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

CPE2.3

External links

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

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.

2) Use-after-free error

EUVDB-ID: #VU15784

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-1000807

CWE-ID: CWE-416 - Use After Free