OpenSSH 6.4 J-PAKE Protocol schnorr.c hash_buffer memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in OpenSSH 6.4. This affects the function hash_buffer of the file schnorr.c of the component J-PAKE Protocol Handler. Executing a manipulation can lead to memory corruption. The identification of this vulnerability is CVE-2014-1692. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in OpenSSH 6.4 (Connectivity Software). This vulnerability affects the function hash_buffer of the file schnorr.c of the component J-PAKE Protocol Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

The hash_buffer function in schnorr.c in OpenSSH through 6.4, when Makefile.inc is modified to enable the J-PAKE protocol, does not initialize certain data structures, which might allow remote attackers to cause a denial of service (memory corruption) or have unspecified other impact via vectors that trigger an error condition.

The weakness was shared 01/29/2014 by Mark Dowd with Zero Day Lab as not defined advisory (Website). The advisory is shared for download at zerodaylab.com. This vulnerability was named CVE-2014-1692 since 01/29/2014. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 73079 (OpenSSH < 6.6 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc.. The commercial vulnerability scanner Qualys is able to test this issue with plugin 185093 (HP-UX running HP Secure Shell Multiple Vulnerabilities (HPSBUX03188)).

Upgrading to version 6.5 eliminates this vulnerability. The upgrade is hosted for download at openbsd.org.Proper firewalling of tcp/22 (ssh) is able to address this issue. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (90819), Tenable (73079), SecurityFocus (BID 65230†), OSVDB (102611†) and Secunia (SA60184†). The entries VDB-12683, VDB-12724, VDB-82642 and VDB-92825 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.7

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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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: 73079
Nessus Name: OpenSSH < 6.6 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSSH 6.5
Firewalling: 🔍

Timelineinfo

01/16/2014 🔍
01/28/2014 +12 days 🔍
01/29/2014 +1 days 🔍
01/29/2014 +0 days 🔍
01/29/2014 +0 days 🔍
01/29/2014 +0 days 🔍
01/31/2014 +2 days 🔍
02/13/2014 +13 days 🔍
03/18/2014 +33 days 🔍
07/31/2014 +135 days 🔍
06/08/2021 +2504 days 🔍

Sourcesinfo

Advisory: zerodaylab.com
Researcher: Mark Dowd
Organization: Zero Day Lab
Status: Not defined
Confirmation: 🔍

CVE: CVE-2014-1692 (🔍)
GCVE (CVE): GCVE-0-2014-1692
GCVE (VulDB): GCVE-100-12124

OVAL: 🔍

X-Force: 90819
SecurityFocus: 65230 - OpenSSH 'schnorr.c' Remote Memory Corruption Vulnerability
Secunia: 60184 - IBM General Parallel File System (GPFS) OpenSSH J-PAKE Memory Corruption Vulnerability, Moderately Critical
OSVDB: 102611
Vulnerability Center: 43251 - OpenSSH <=6.4 Remote DoS or Other Impact Vulnerability in J-PAKE Protocol, High

See also: 🔍

Entryinfo

Created: 01/31/2014 12:11
Updated: 06/08/2021 21:02
Changes: 01/31/2014 12:11 (76), 05/20/2017 10:40 (8), 06/08/2021 21:02 (3)
Complete: 🔍
Cache ID: 216:D39:103

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