#VU70398 NULL pointer dereference in OpenSSL - CVE-2015-0291

Vulnerability identifier: #VU70398

Vulnerability risk: Medium

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:Green]

CVE-ID: CVE-2015-0291

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

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

The vulnerability exists due to a NULL pointer dereference error in the sigalgs implementation in t1_lib.c. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.2

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External links
https://git.openssl.org/?p=openssl.git;a=commit;h=76343947ada960b6269090638f5391068daee88d
https://www.openssl.org/news/secadv_20150319.txt
https://bugzilla.redhat.com/show_bug.cgi?id=1202338
https://www.securitytracker.com/id/1031929
https://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
https://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
https://bto.bluecoat.com/security-advisory/sa92
https://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
https://marc.info/?l=bugtraq&m=144050297101809&w=2
https://marc.info/?l=bugtraq&m=143748090628601&w=2
https://marc.info/?l=bugtraq&m=144050155601375&w=2
https://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
https://www.securityfocus.com/bid/73235
https://www.fortiguard.com/advisory/2015-03-24-openssl-vulnerabilities-march-2015
https://security.gentoo.org/glsa/201503-11
https://kc.mcafee.com/corporate/index?page=content&id=SB10110
https://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

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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.