OpenSSH 6.2/6.3 Post Authentication sshd process initialize mm_newkeys_from_blob access control

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in OpenSSH 6.2/6.3. This vulnerability affects the function mm_newkeys_from_blob of the file initialize of the component Post Authentication sshd process. The manipulation results in access control. This vulnerability is cataloged as CVE-2013-4548. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in OpenSSH 6.2/6.3 (Connectivity Software). Affected is the function mm_newkeys_from_blob of the file initialize of the component Post Authentication sshd process. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, and integrity. CVE summarizes:

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

The weakness was shared 11/07/2013 by Markus Friedl as OpenSSH Security Advisory: gcmrekey.adv as confirmed advisory (Website). The advisory is shared for download at openssh.com. The vendor cooperated in the coordination of the public release. This vulnerability is traded as CVE-2013-4548 since 06/12/2013. It is possible to launch the attack remotely. The successful exploitation needs a authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 73308 (AIX OpenSSH Vulnerability : openssh_advisory3.asc), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 42420 (OpenSSH AES-GCM Cipher Remote Code Execution Vulnerability).

Upgrading to version 6.4 eliminates this vulnerability. The upgrade is hosted for download at openssh.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (73308), SecurityFocus (BID 63605†), OSVDB (99551†), Secunia (SA55594†) and Vulnerability Center (SBV-42333†). Further details are available at packetstormsecurity.com. Once again VulDB remains the best source for vulnerability data.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
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: 73308
Nessus Name: AIX OpenSSH Vulnerability : openssh_advisory3.asc
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 850553
OpenVAS Name: SuSE Update for openssh openSUSE-SU-2013:1726-1 (openssh)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: OpenSSH 6.4
PaloAlto IPS: 🔍

Timelineinfo

06/12/2013 🔍
11/07/2013 +148 days 🔍
11/07/2013 +0 days 🔍
11/07/2013 +0 days 🔍
11/08/2013 +1 days 🔍
11/14/2013 +6 days 🔍
11/19/2013 +5 days 🔍
04/02/2014 +134 days 🔍
06/01/2021 +2617 days 🔍

Sourcesinfo

Advisory: OpenSSH Security Advisory: gcmrekey.adv
Researcher: Markus Friedl
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-4548 (🔍)
GCVE (CVE): GCVE-0-2013-4548
GCVE (VulDB): GCVE-100-11124

OVAL: 🔍

SecurityFocus: 63605
Secunia: 55594 - OpenSSH AES-GCM Ciphers Privilege Escalation Vulnerability, Not Critical
OSVDB: 99551
Vulnerability Center: 42333 - OpenSSH 6.2 and 6.3 Remote Code Execution Vulnerability Due to Memory Corruption, Medium

Misc.: 🔍

Entryinfo

Created: 11/14/2013 10:58
Updated: 06/01/2021 22:25
Changes: 11/14/2013 10:58 (84), 05/15/2017 11:43 (1), 06/01/2021 22:25 (3)
Complete: 🔍
Committer:
Cache ID: 216::103

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