SSH Secure Shell 1.2.23/1.2.25 CBC/CFB Modes Insertion missing encryption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1$0-$5k0.02

A vulnerability was found in SSH Secure Shell 1.2.23/1.2.25 (SSH Server Software) and classified as critical. This issue affects some unknown processing of the component CBC/CFB Modes. The manipulation with an unknown input leads to a missing encryption vulnerability (Insertion). Using CWE to declare the problem leads to CWE-311. The product does not encrypt sensitive or critical information before storage or transmission. Impacted is integrity. The summary by CVE is:

SSH 1.2.25, 1.2.23, and other versions, when used in in CBC (Cipher Block Chaining) or CFB (Cipher Feedback 64 bits) modes, allows remote attackers to insert arbitrary data into an existing stream between an SSH client and server by using a known plaintext attack and computing a valid CRC-32 checksum for the packet, aka the "SSH insertion attack."

The weakness was presented 06/12/1998 as not defined posting (Bugtraq). The advisory is shared at marc.theaimsgroup.com. The identification of this vulnerability is CVE-1999-1085. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/04/2019). MITRE ATT&CK project uses the attack technique T1600 for this issue. Due to its background and reception, this vulnerability has a historic impact.

The vulnerability scanner Nessus provides a plugin with the ID 10268 (SSH CBC/CFB Data Stream Injection), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (1126) and Tenable (10268). kb.cert.org is providing further details.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Name: Insertion
Class: Missing encryption / Insertion
CWE: CWE-311 / CWE-310
ATT&CK: T1600

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 10268
Nessus Name: SSH CBC/CFB Data Stream Injection
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/12/1998 🔍
06/12/1998 +0 days 🔍
06/12/1998 +0 days 🔍
07/23/1999 +406 days 🔍
10/09/2002 +1174 days 🔍
06/19/2014 +4271 days 🔍
05/04/2019 +1780 days 🔍

Sourcesinfo

Advisory: marc.theaimsgroup.com
Status: Not defined

CVE: CVE-1999-1085 (🔍)
X-Force: 1126 - SSH can accept inserted data in encrypted sessions
Vulnerability Center: 63 - SSH in CBC/CFB Mode Allows Arbitrary Data Insert via Known Plaintext Attack, Low

Misc.: 🔍

Entryinfo

Created: 06/19/2014 15:52
Updated: 05/04/2019 20:23
Changes: 06/19/2014 15:52 (43), 05/04/2019 20:23 (24)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

Want to stay up to date on a daily basis?

Enable the mail alert feature now!