MIT Kerberos 5 up to 1.15.2 X.509 Data pkinit_crypto_openssl.c get_matching_data/X509_NAME_oneline_ex DN memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in MIT Kerberos 5 up to 1.15.2. Affected is the function get_matching_data/X509_NAME_oneline_ex of the file plugins/preauth/pkinit/pkinit_crypto_openssl.c of the component X.509 Data Handler. The manipulation of the argument DN leads to memory corruption. This vulnerability is referenced as CVE-2017-15088. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in MIT Kerberos 5 up to 1.15.2 (Network Authentication Software). This issue affects the function get_matching_data/X509_NAME_oneline_ex of the file plugins/preauth/pkinit/pkinit_crypto_openssl.c of the component X.509 Data Handler. The manipulation of the argument DN with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 11/02/2017. The weakness was published 11/23/2017 (Website). It is possible to read the advisory at bugs.debian.org. The identification of this vulnerability is CVE-2017-15088 since 10/08/2017. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 104524 (openSUSE Security Update : krb5 (openSUSE-2017-1266)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277060 (Fedora Security Update for krb5 (FEDORA-2017-41957e0f90)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (104524) and SecurityFocus (BID 101594†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 104524
Nessus Name: openSUSE Security Update : krb5 (openSUSE-2017-1266)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 831131
OpenVAS Name: SuSE Update for krb5 openSUSE-SU-2017:2993-1 (krb5)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

10/08/2017 🔍
10/27/2017 +19 days 🔍
11/02/2017 +6 days 🔍
11/10/2017 +8 days 🔍
11/13/2017 +3 days 🔍
11/23/2017 +10 days 🔍
11/23/2017 +0 days 🔍
11/24/2017 +1 days 🔍
01/16/2023 +1879 days 🔍

Sourcesinfo

Vendor: mit.edu

Advisory: fbb687db1088ddd894d975996e5f6a4252b9a2b4
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-15088 (🔍)
GCVE (CVE): GCVE-0-2017-15088
GCVE (VulDB): GCVE-100-109955
SecurityFocus: 101594 - MIT krb5 CVE-2017-15088 Remote Buffer Overflow Vulnerability

Entryinfo

Created: 11/24/2017 08:13
Updated: 01/16/2023 10:03
Changes: 11/24/2017 08:13 (76), 12/10/2019 15:34 (6), 01/16/2023 10:02 (5), 01/16/2023 10:03 (1)
Complete: 🔍
Cache ID: 216::103

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