Cisco ASA 5500 TLS Protocol Bleichenbacher cryptographic issue

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco ASA 5500. Impacted is an unknown function of the component TLS Protocol Handler. Performing a manipulation results in cryptographic issue (Bleichenbacher). This vulnerability is cataloged as CVE-2017-12373. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Cisco ASA 5500 (Firewall Software) (the affected version is unknown). This affects an unknown code of the component TLS Protocol Handler. The manipulation with an unknown input leads to a cryptographic issue vulnerability (Bleichenbacher). CWE is classifying the issue as CWE-310. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the TLS protocol implementation of legacy Cisco ASA 5500 Series (ASA 5505, 5510, 5520, 5540, and 5550) devices could allow an unauthenticated, remote attacker to access sensitive information, aka a Return of Bleichenbacher's Oracle Threat (ROBOT) attack. An attacker could iteratively query a server running a vulnerable TLS stack implementation to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions. Cisco Bug IDs: CSCvg97652.

The bug was discovered 12/12/2017. The weakness was shared 12/15/2017 by Juraj Somorovsky with Tripwire VERT as cisco-sa-20171212-bleichenbach as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is uniquely identified as CVE-2017-12373 since 08/03/2017. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1600 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 105415 (Return Of Bleichenbacher's Oracle Threat (ROBOT) Information Disclosure), which helps to determine the existence of the flaw in a target environment. It is assigned to the family General and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38695 (TLS ROBOT Vulnerability Detected).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (105415) and SecurityFocus (BID 102170†). The entries VDB-97507, VDB-110567, VDB-110568 and VDB-110662 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: Bleichenbacher
Class: Cryptographic issue / Bleichenbacher
CWE: CWE-310
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: 105415
Nessus Name: Return Of Bleichenbacher's Oracle Threat (ROBOT) Information Disclosure
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/03/2017 🔍
12/12/2017 +131 days 🔍
12/12/2017 +0 days 🔍
12/15/2017 +3 days 🔍
12/15/2017 +0 days 🔍
12/16/2017 +1 days 🔍
12/26/2017 +10 days 🔍
12/15/2019 +719 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20171212-bleichenbach
Researcher: Juraj Somorovsky
Organization: Tripwire VERT
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12373 (🔍)
GCVE (CVE): GCVE-0-2017-12373
GCVE (VulDB): GCVE-100-110709
SecurityFocus: 102170 - Multiple Cisco Products Multiple Information Disclosure Vulnerabilities

See also: 🔍

Entryinfo

Created: 12/16/2017 16:24
Updated: 12/15/2019 13:32
Changes: 12/16/2017 16:24 (72), 12/15/2019 13:32 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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