CVE-2016-3959

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-05-23 · updated 2026-06-17
Weakness: CWE-20

Description

The Verify function in crypto/dsa/dsa.go in Go before 1.5.4 and 1.6.x before 1.6.1 does not properly check parameters passed to the big integer library, which might allow remote attackers to cause a denial of service (infinite loop) via a crafted public key to a program that uses HTTPS client certificates or SSH server libraries.

Affected products

Fedoraproject Fedora: 22, 23, 24
Go: through 1.5; 1.6
openSUSE Leap: 42.1

References

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182526.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183106.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183137.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00077.html
http://rhn.redhat.com/errata/RHSA-2016-1538.html
http://www.openwall.com/lists/oss-security/2016/04/05/1
http://www.openwall.com/lists/oss-security/2016/04/05/2
https://go-review.googlesource.com/#/c/21533/
https://groups.google.com/forum/#%21topic/golang-announce/9eqIHqaWvck
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182526.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183106.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183137.html

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