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CVE-2018-0739

UnknownEPSS 19.30%

Last modified

CVE-2018-0739 is a vulnerability of currently unknown severity. 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. EPSS estimates a 19.30% chance of exploitation in the next 30 days.

Description

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).

Metrics

EPSS Probability
19.30%

97.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OpensslOpenssl>= 1.0.2b, <= 1.0.2n
OpensslOpenssl>= 1.1.0, <= 1.1.0g
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux17.10
DebianDebian Linux7.0
DebianDebian Linux8.0
DebianDebian Linux9.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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).
How severe is CVE-2018-0739?
Severity scoring for CVE-2018-0739 is pending analysis. The EPSS model estimates a 19.30% probability of exploitation in the next 30 days.
How do I fix CVE-2018-0739?
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.

Are you affected by CVE-2018-0739?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST