OpenSSL 1.0.2 DTLSv1_listen null pointer dereference

CVSS Meta Temp Score
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4.6$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in OpenSSL 1.0.2 (Network Encryption Software). This issue affects the function DTLSv1_listen. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

The issue has been introduced in 03/19/2015. The weakness was published 03/19/2015 by Stephen Henson as secadv_20150319.txt as confirmed advisory (Website). The advisory is shared at openssl.org. The identification of this vulnerability is CVE-2015-0207 since 11/18/2014. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The advisory points out:

The DTLSv1_listen function is intended to be stateless and processes the initial ClientHello from many peers. It is common for user code to loop over the call to DTLSv1_listen until a valid ClientHello is received with an associated cookie. A defect in the implementation of DTLSv1_listen means that state is preserved in the SSL object from one invocation to the next that can lead to a segmentation fault. Errors processing the initial ClientHello can trigger this scenario. An example of such an error could be that a DTLS1.0 only client is attempting to connect to a DTLS1.2 only server.

The vulnerability scanner Nessus provides a plugin with the ID 82077 (stunnel < 5.12 OpenSSL Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370183 (HP Systems Insight Manager Multiple Vulnerabilities).

Upgrading to version 1.0.2a eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (101665) and Tenable (82077). grahamcluley.com is providing further details. Similar entries are available at 74043, 74044, 74046 and 74047.

Productinfo

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  • end of life (old version)

CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Nessus ID: 82077
Nessus Name: stunnel < 5.12 OpenSSL Multiple Vulnerabilities
Nessus File: 🔍
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OpenVAS ID: 902837
OpenVAS Name: OpenSSL Multiple Vulnerabilities -01 Nov15 (Linux)
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Upgrade: OpenSSL 1.0.2a
Patch: 819418110b6fff4a7b96f01a5d68f71df3e3b736

Timelineinfo

11/18/2014 🔍
03/16/2015 +118 days 🔍
03/18/2015 +2 days 🔍
03/19/2015 +0 days 🔍
03/19/2015 +0 days 🔍
03/19/2015 +0 days 🔍
03/19/2015 +0 days 🔍
03/20/2015 +1 days 🔍
03/24/2015 +4 days 🔍
07/20/2015 +117 days 🔍
03/01/2016 +226 days 🔍
04/15/2022 +2235 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: secadv_20150319.txt
Researcher: Stephen Henson
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-0207 (🔍)
X-Force: 101665 - OpenSSL DTLSv1_listen denial of service
SecurityTracker: 1031929
Vulnerability Center: 56882 - OpenSSL Remote DoS via Crafted DTLS Traffic - CVE-2015-0207, Medium
SecurityFocus: 73225 - OpenSSL 'ASN1_TYPE_cmp()' Function Denial of Service Vulnerability

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Entryinfo

Created: 03/20/2015 09:51
Updated: 04/15/2022 20:36
Changes: 03/20/2015 09:51 (73), 08/25/2018 09:14 (14), 04/15/2022 20:36 (5)
Complete: 🔍

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