Buffer overflow - CVE-2017-15088
Published: November 23, 2017 / Updated: August 4, 2020
Vulnerability identifier: #VU33498
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-15088
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
plugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin code that is specific to Red Hat.
Affected software
krb5 (Alpine package)
krb5
SUSE Linux
Fedora
Opensuse
krb5
SUSE Linux
Fedora
Opensuse
How to mitigate CVE-2017-15088
Install update from vendor's website.
krb5 (Alpine package) - update to 1.15.3-r0
krb5 - addressed in versions 1.15.2-4.fc26, 1.15.2-4.fc27
krb5 - addressed in versions 1.15.2-4.fc26, 1.15.2-4.fc27