TLS-SSL - CVE-2018-0739D Subscribe to Security Advisories

Thursday, August 9, 2018
Thursday, August 9, 2018
Summary 

In March 2018, openssl.org released a security advisory detailing several security issues. The following vulnerabilities that may affect the TLS/SSL data plane of ACOS devices reported in that advisory are addressed in this document.

Item # Vulnerability ID Score Source Score Summary
1 CVE-2018-0739 CVSS 3.0 6.4 Medium openssl: Handling of crafted recursive ASN.1 structures can cause a stack overflow and resulting denial of service

Affected Releases

The table below indicates releases of ACOS exposed to these vulnerabilities and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.

Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.

Releases AffectedReleases Resolved or Unaffected

4.1.4 – 4.1.4-P1

4.1.4-P2

4.1.2 – 4.1.2-P4

4.1.2-P5

4.1.1 – 4.1.1-P8

4.1.1-P9

4.1.0 – 4.1.0-P11

4.1.0-P12

2.7.2 – 2.7.2-P12

2.7.2-P13

2.7.1-GR1 – 2.7.1-GR1-Px

2.7.2-P13, 4.1.0-P12, 4.1.1-P9, 4.1.4-P2

2.6.1-GR1 – 2.6.1-GR1-P16

2.7.2-P13, 4.1.0-P12, 4.1.1-P9, 4.1.4-P2

Workarounds and Mitigations 

None.

Software Updates 

Software updates that address these vulnerabilities are or will be published at the following URL:
https://www.a10networks.com/support/axseries/software-downloads

Vulnerability Details

The following table shares brief descriptions of the vulnerabilities addressed in this document.

Vulnerability IDVulnerability Description
CVE-2018-0739

Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe.

Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g).
Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).

Acknowledgements 

None.

Modification History 
RevisionDateDescription
1.0
August 09, 2018

Initial Publication