Juniper ScreenOS 6.3.0r20 SSH Negotiation input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Juniper ScreenOS 6.3.0r20. This affects an unknown function of the component SSH Negotiation. Performing a manipulation results in input validation. This vulnerability is reported as CVE-2015-7754. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Juniper ScreenOS 6.3.0r20 (Router Operating System). This affects an unknown functionality of the component SSH Negotiation. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Juniper ScreenOS before 6.3.0r21, when ssh-pka is configured and enabled, allows remote attackers to cause a denial of service (system crash) or execute arbitrary code via crafted SSH negotiation.

The weakness was disclosed 12/17/2015 as JSA10712 / PR 1139205 as confirmed advisory (Website). The advisory is shared at kb.juniper.net. This vulnerability is uniquely identified as CVE-2015-7754 since 10/08/2015. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 87539 (Juniper ScreenOS 6.3.0r20 SSH ssh-pka SSH Negotiation RCE (JSA10712)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Firewalls and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38652 (Juniper ScreenOS Denial of Service Vulnerability (JSA10712)).

Upgrading to version 6.3.0r21 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Restrict management access to specific IP addresses. Refer to KB3905 for more information about restricting management access in ScreenOS.

The vulnerability is also documented in the databases at Tenable (87539), SecurityFocus (BID 79627†), SecurityTracker (ID 1034490†) and Vulnerability Center (SBV-55335†). The entries VDB-79855 and VDB-79856 are pretty similar. 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: 8.1
VulDB Meta Temp Score: 7.9

VulDB Base Score: 8.1
VulDB Temp Score: 7.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: 87539
Nessus Name: Juniper ScreenOS 6.3.0r20 SSH ssh-pka SSH Negotiation RCE (JSA10712)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802738
OpenVAS Name: Backdoor in ScreenOS
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: ScreenOS 6.3.0r21

Timelineinfo

10/08/2015 🔍
12/17/2015 +70 days 🔍
12/17/2015 +0 days 🔍
12/17/2015 +0 days 🔍
12/17/2015 +0 days 🔍
12/18/2015 +1 days 🔍
12/18/2015 +0 days 🔍
12/20/2015 +2 days 🔍
12/21/2015 +1 days 🔍
01/08/2016 +18 days 🔍
11/16/2024 +3235 days 🔍

Sourcesinfo

Vendor: juniper.net

Advisory: JSA10712 / PR 1139205
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7754 (🔍)
GCVE (CVE): GCVE-0-2015-7754
GCVE (VulDB): GCVE-100-79857
SecurityFocus: 79627 - Juniper ScreenOS CVE-2015-7754 Denial of Service Vulnerability
SecurityTracker: 1034490
Vulnerability Center: 55335 - Juniper ScreenOS <6.3.0r21 Remote DoS or Code Execution during Crafted SSH Negotiation, Critical

See also: 🔍

Entryinfo

Created: 12/18/2015 14:53
Updated: 11/16/2024 05:39
Changes: 12/18/2015 14:53 (76), 06/19/2018 21:00 (14), 11/16/2024 05:39 (19)
Complete: 🔍
Cache ID: 216:7B1:103

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