CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
7.4 | $0-$5k | 0.00 |
A vulnerability classified as problematic was found in OpenSSL (Network Encryption Software) (version unknown). Affected by this vulnerability is the function BN_bn2dec
of the file crypto/bn/bn_print.c. The manipulation of the argument t
with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability.
The bug was discovered 08/25/2016. The weakness was disclosed 08/16/2016 by Shi Lei as USN-3087-1 as confirmed git commit (GIT Repository). The advisory is shared at git.openssl.org. The public release has been coordinated in cooperation with the project team. This vulnerability is known as CVE-2016-2182 since 01/29/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. Responsible for the vulnerability is the following code:
bn_data = OPENSSL_malloc((num / BN_DEC_NUM + 1) * sizeof(BN_ULONG));
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)).
Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.openssl.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:
bn_data_num = num / BN_DEC_NUM + 1; bn_data = OPENSSL_malloc(bn_data_num * sizeof(BN_ULONG));The git commit contains the following remark:
Fix by checking return value of BN_div_word() and checking writes don't overflow buffer.
The vulnerability is also documented in the vulnerability database at Tenable (95255). The entries 87879, 88080, 90396 and 90939 are pretty similar.
Product
Type
Name
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 7.5VulDB Meta Temp Score: 7.4
VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 9.8
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Out-of-bounds writeCWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Nessus ID: 95255
Nessus Name: AIX OpenSSL Advisory : openssl_advisory21.asc (SWEET32)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
OpenVAS ID: 59958
OpenVAS Name: RedHat Update for openssl RHSA-2016:1940-01
OpenVAS File: 🔍
OpenVAS Family: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Patch: 07bed46f332fce8c1d157689a2cdf915a982ae34
Timeline
01/29/2016 🔍08/16/2016 🔍
08/16/2016 🔍
08/16/2016 🔍
08/25/2016 🔍
08/25/2016 🔍
08/25/2016 🔍
09/16/2016 🔍
11/22/2016 🔍
09/14/2022 🔍
Sources
Product: openssl.orgAdvisory: USN-3087-1
Researcher: Shi Lei
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍
CVE: CVE-2016-2182 (🔍)
OVAL: 🔍
SecurityTracker: 1036688
SecurityFocus: 92557 - OpenSSL 'BN_bn2dec()' Function Out of Bounds Write Denial of Service Vulnerability
See also: 🔍
Entry
Created: 08/25/2016 11:29Updated: 09/14/2022 09:56
Changes: 08/25/2016 11:29 (86), 07/07/2019 15:53 (7), 09/14/2022 09:56 (5)
Complete: 🔍
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