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CVE-2019-1559

MEDIUMCVSS 5.9/10EPSS 17.14%

Last modified

CVE-2019-1559 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. EPSS estimates a 17.14% chance of exploitation in the next 30 days.

Description

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

Metrics

CVSS 3.1
5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability
17.14%

96.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OpensslOpenssl>= 1.0.2, < 1.0.2r
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux18.10
DebianDebian Linux8.0
DebianDebian Linux9.0
NetappActive Iq Unified Manager>= 7.3
NetappActive Iq Unified Manager>= 9.5
NetappActive Iq Unified ManagerAll versions
NetappAltavaultAll versions
NetappCloud BackupAll versions
NetappClustered Data Ontap Antivirus ConnectorAll versions
NetappElement SoftwareAll versions
NetappHci Management NodeAll versions
NetappHyper Converged InfrastructureAll versions
NetappOncommand InsightAll versions
NetappOncommand Unified ManagerAll versions
NetappOncommand Unified Manager Core PackageAll versions
NetappOncommand Workflow AutomationAll versions
NetappOntap Select DeployAll versions
NetappOntap Select Deploy Administration UtilityAll versions
NetappSantricity Smi-S ProviderAll versions
NetappService ProcessorAll versions
NetappSmi-S ProviderAll versions
NetappSnapcenterAll versions
NetappSnapdriveAll versions
NetappSnapprotectAll versions
NetappSolidfireAll versions
NetappSteelstore Cloud Integrated StorageAll versions
NetappStorage Automation StoreAll versions
NetappStoragegrid>= 9.0.0, <= 9.0.4
NetappStoragegridAll versions
NetappHci Compute NodeAll versions
F5Big-Ip Access Policy Manager>= 12.1.0, <= 12.1.5
F5Big-Ip Access Policy Manager>= 13.0.0, <= 13.1.3
F5Big-Ip Access Policy Manager>= 14.0.0, <= 14.1.2
F5Big-Ip Access Policy Manager>= 15.0.0, <= 15.1.0
F5Big-Ip Advanced Firewall Manager>= 12.1.0, <= 12.1.5
F5Big-Ip Advanced Firewall Manager>= 13.0.0, <= 13.1.3
F5Big-Ip Advanced Firewall Manager>= 14.0.0, <= 14.1.2
F5Big-Ip Advanced Firewall Manager>= 15.0.0, <= 15.1.0
F5Big-Ip Analytics>= 12.1.0, <= 12.1.5
F5Big-Ip Analytics>= 13.0.0, <= 13.1.3
F5Big-Ip Analytics>= 14.0.0, <= 14.1.2
F5Big-Ip Analytics>= 15.0.0, <= 15.1.0
F5Big-Ip Application Acceleration Manager>= 12.1.0, <= 12.1.5
F5Big-Ip Application Acceleration Manager>= 13.0.0, <= 13.1.3
F5Big-Ip Application Acceleration Manager>= 14.0.0, <= 14.1.2
F5Big-Ip Application Acceleration Manager>= 15.0.0, <= 15.1.0
F5Big-Ip Application Security Manager>= 12.1.0, <= 12.1.5

Showing 50 of 167 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-1559?
If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).
How severe is CVE-2019-1559?
CVE-2019-1559 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 17.14% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1559?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST