OpenSSL 1.0.2i CRL Sanity Check null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in OpenSSL 1.0.2i. This affects an unknown part of the component CRL Sanity Check. The manipulation results in null pointer dereference. This vulnerability is known as CVE-2016-7052. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in OpenSSL 1.0.2i (Network Encryption Software). Affected is an unknown code block of the component CRL Sanity Check. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

crypto/x509/x509_vfy.c in OpenSSL 1.0.2i allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by triggering a CRL operation.

The bug was discovered 09/26/2016. The weakness was published 09/26/2016 as 20160926.txt as confirmed advisory (Website). The advisory is shared for download at openssl.org. The public release has been coordinated with the vendor. This vulnerability is traded as CVE-2016-7052 since 08/23/2016. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The advisory points out:

A bug fix which included a CRL sanity check was added to OpenSSL 1.1.0 but was omitted from OpenSSL 1.0.2i. As a result any attempt to use CRLs in OpenSSL 1.0.2i will crash with a null pointer exception.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 95255 (AIX OpenSSL Advisory : openssl_advisory21.asc (SWEET32)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316384 (Cisco Unity Express OpenSSL Multiple Vulnerabilities (cisco-sa-20160927-openssl)).

Upgrading to version 1.0.2j 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 Tenable (95255) and SecurityFocus (BID 93171†). Similar entries are available at VDB-87879, VDB-88080, VDB-90396 and VDB-90937. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

Support

  • end of life (old version)

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 95255
Nessus Name: AIX OpenSSL Advisory : openssl_advisory21.asc (SWEET32)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53730
OpenVAS Name: Fedora Update for openssl FEDORA-2016-97454404fe
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: OpenSSL 1.0.2j
Patch: 6e629b5be45face20b4ca71c4fcbfed78b864a2e

Timelineinfo

08/23/2016 🔍
09/22/2016 +30 days 🔍
09/26/2016 +4 days 🔍
09/26/2016 +0 days 🔍
09/26/2016 +0 days 🔍
09/26/2016 +0 days 🔍
09/26/2016 +0 days 🔍
09/26/2016 +0 days 🔍
11/22/2016 +57 days 🔍
09/21/2022 +2129 days 🔍

Sourcesinfo

Product: openssl.org

Advisory: 20160926.txt
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-7052 (🔍)
GCVE (CVE): GCVE-0-2016-7052
GCVE (VulDB): GCVE-100-92160

OVAL: 🔍

SecurityFocus: 93171 - OpenSSL CVE-2016-7052 Denial of Service Vulnerability
SecurityTracker: 1036885

See also: 🔍

Entryinfo

Created: 09/26/2016 17:37
Updated: 09/21/2022 11:17
Changes: 09/26/2016 17:37 (83), 07/07/2019 17:01 (5), 09/21/2022 11:17 (5)
Complete: 🔍
Cache ID: 216:7CD:103

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