OpenSSH up to 6.x on Non-OpenBSD sshd monitor.c MONITOR_REQ_PAM_INIT_CTX Request input validation
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.2 | $0-$5k | 0.00 |
A vulnerability was found in OpenSSH up to 6.x on Non-OpenBSD (Connectivity Software) and classified as problematic. Affected by this issue is an unknown code of the file monitor.c of the component sshd. The manipulation as part of a MONITOR_REQ_PAM_INIT_CTX Request leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:
The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.
The weakness was released 08/24/2015 by Moritz Jodeit as confirmed mailinglist post (oss-sec). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2015-6563 since 08/21/2015. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.
The vulnerability scanner Nessus provides a plugin with the ID 86656 (AIX OpenSSH Advisory : openssh_advisory6.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 236003 (Red Hat Update for openssh (RHSA-2016:0741)).
Upgrading to version 7.0 eliminates this vulnerability.
The vulnerability is also documented in the databases at X-Force (105881) and Tenable (86656). Entries connected to this vulnerability are available at 77397, 77398, 78828 and 80656.
Product
Type
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.9VulDB Meta Temp Score: 5.2
VulDB Base Score: 5.9
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Input validationCWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍
Local: Yes
Remote: No
Availability: 🔍
Status: Unproven
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Nessus ID: 86656
Nessus Name: AIX OpenSSH Advisory : openssh_advisory6.asc
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2015-625
OpenVAS File: 🔍
OpenVAS Family: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Upgrade: OpenSSH 7.0
Patch: github.com
Timeline
08/12/2015 🔍08/21/2015 🔍
08/23/2015 🔍
08/24/2015 🔍
08/24/2015 🔍
06/13/2022 🔍
Sources
Advisory: d4697fe9a28dab7255c60433e4dd23cf7fce8a8bResearcher: Moritz Jodeit
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2015-6563 (🔍)
OVAL: 🔍
X-Force: 105881 - OpenSSH monitor component security bypass
SecurityFocus: 76317 - OpenSSH PAM Support Multiple Remote Code Execution Vulnerabilities
See also: 🔍
Entry
Created: 08/24/2015 10:17Updated: 06/13/2022 08:47
Changes: 08/24/2015 10:17 (52), 11/05/2017 00:47 (22), 06/13/2022 08:40 (4), 06/13/2022 08:44 (1), 06/13/2022 08:47 (1)
Complete: 🔍
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