National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2019-12677 Detail

Current Description

A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device. The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker could exploit this vulnerability by opening many SSL VPN sessions to an affected device. The attacker would need to have valid user credentials on the affected device to exploit this vulnerability. A successful exploit could allow the attacker to overwrite a special system memory location, which will eventually result in memory allocation errors for new SSL/TLS sessions to the device, preventing successful establishment of these sessions. A reload of the device is required to recover from this condition. Established SSL/TLS connections to the device and SSL/TLS connections through the device are not affected. Note: Although this vulnerability is in the SSL VPN feature, successful exploitation of this vulnerability would affect all new SSL/TLS sessions to the device, including management sessions.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.1 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (V3.1 legend)
Impact Score: 3.6
Exploitability Score: 2.8


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 4.0 MEDIUM
Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-asa-ssl-vpn-dos Vendor Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Handling of Exceptional Conditions (CWE-755)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
9.1.7.4
 cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
9.2
Up to (excluding)
9.2.4.8
 cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
9.3
Up to (excluding)
9.3.3.9
 cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
9.4
Up to (excluding)
9.4.2.11
 cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
9.5
Up to (excluding)
9.5.2.5
 cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
9.6
Up to (excluding)
9.6.2
Running on/with
 cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5510:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5520:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5550:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2019-12677
NVD Published Date:
10/02/2019
NVD Last Modified:
10/09/2019