OpenBSD OpenSSH up to 3.x File Descriptors ssh-keysign.c information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in OpenBSD OpenSSH up to 3.x. Affected is an unknown function of the file ssh-keysign.c of the component File Descriptors. Performing a manipulation results in information disclosure. This vulnerability is known as CVE-2011-4327. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in OpenBSD OpenSSH up to 3.x (Connectivity Software). This affects some unknown functionality of the file ssh-keysign.c of the component File Descriptors. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

ssh-keysign.c in ssh-keysign in OpenSSH before 5.8p2 on certain platforms executes ssh-rand-helper with unintended open file descriptors, which allows local users to obtain sensitive key information via the ptrace system call.

The weakness was published 02/02/2014 by Tomas Mraz as Bug 755640 as not defined bug report (Bugzilla). The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2011-4327. The exploitability is told to be easy. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 53841 (Portable OpenSSH ssh-keysign ssh-rand-helper Utility File Descriptor Leak Local Information Disclosure), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc..

Upgrading to version 3.3p1 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (67264), Tenable (53841), SecurityFocus (BID 47691†), OSVDB (72183†) and Vulnerability Center (SBV-31449†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.0
VulDB Temp Score: 3.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

ADP CISA Base Score: 5.5
ADP CISA Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 53841
Nessus Name: Portable OpenSSH ssh-keysign ssh-rand-helper Utility File Descriptor Leak Local Information Disclosure
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSSH 3.3p1

Timelineinfo

05/03/2011 🔍
05/03/2011 +0 days 🔍
05/09/2011 +6 days 🔍
05/15/2011 +6 days 🔍
11/04/2011 +172 days 🔍
02/02/2014 +821 days 🔍
02/02/2014 +0 days 🔍
03/24/2015 +415 days 🔍
05/29/2026 +4084 days 🔍

Sourcesinfo

Vendor: openbsd.org

Advisory: Bug 755640
Researcher: Tomas Mraz
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-4327 (🔍)
GCVE (CVE): GCVE-0-2011-4327
GCVE (VulDB): GCVE-100-66285
X-Force: 67264
SecurityFocus: 47691 - Portable OpenSSH 'ssh-keysign' Local Unauthorized Access Vulnerability
Secunia: 44347
OSVDB: 72183
Vulnerability Center: 31449 - Portable OpenSSH \x3C5.8p2 \x27ssh-rand-helper\x27 Allows Local Unauthorized Access to Host Keys, Low

Entryinfo

Created: 03/24/2015 15:54
Updated: 05/29/2026 23:40
Changes: 03/24/2015 15:54 (59), 03/22/2017 09:53 (10), 02/01/2022 08:43 (4), 02/01/2022 08:48 (2), 05/29/2026 23:40 (28)
Complete: 🔍
Cache ID: 216::103

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