Medium severity · published Jul 26, 2018
CVE-2017-7562
An authentication bypass flaw was found in the way krb5's certauth interface before 1.16.1 handled the validation of client certificates
6.5
CVSS
3.2%
EPSS
No
On KEV
Description
An authentication bypass flaw was found in the way krb5's certauth interface before 1.16.1 handled the validation of client certificates. A remote attacker able to communicate with the KDC could potentially use this flaw to impersonate arbitrary principals under rare and erroneous circumstances.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.2% · higher than 88% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
7.0 · source: NVD
EL
Enterprise Linux Desktop · Redhat
7.0 · source: NVD
EL
Enterprise Linux Server · Redhat
7.0 · source: NVD
EL
Enterprise Linux Workstation · Redhat
7.0 · source: NVD
K5
Kerberos 5 · Mit
1.0 before 1.16.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-7562
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-7562
Third Party Advisory
http://www.securityfocus.com/bid/100511
Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0666
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562
Patch
https://github.com/krb5/krb5/pull/694
Third Party Advisory
https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196
Third Party Advisory
https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2
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