IBM AIX 3.1/3.2 rexd Service improper authentication

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.
3.5$0-$5k0.00

Summaryinfo

A vulnerability was found in IBM AIX 3.1/3.2. It has been rated as critical. This vulnerability affects unknown code of the component rexd Service. The manipulation leads to improper authentication. This vulnerability is listed as CVE-1999-0627. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in IBM AIX 3.1/3.2 (Operating System). It has been rated as problematic. This issue affects an unknown function of the component rexd Service. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. The impact remains unknown. The summary by CVE is:

The rexd service is running, which uses weak authentication that can allow an attacker to execute commands.

The issue has been introduced in 02/01/1990. The weakness was presented 03/01/1992 with CERT/CC (Website). It is possible to read the advisory at securitydigest.org. The identification of this vulnerability is CVE-1999-0627. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but an exploit is available.

The exploit is available at immunitysec.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 759 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 10224 (rexd service), which helps to determine the existence of the flaw in a target environment. It is assigned to the family RPC. The commercial vulnerability scanner Qualys is able to test this issue with plugin 66031 (Checking Presence of the rpc rex deamon).

Upgrading to version 4.0 eliminates this vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 601.

The vulnerability is also documented in the databases at X-Force (101), Tenable (10224), SecurityFocus (BID 37†), OSVDB (11450†) and Vulnerability Center (SBV-20†). See VDB-82, VDB-332, VDB-333 and VDB-427 for similar entries. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.9
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.9
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 10224
Nessus Name: rexd service
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: AIX 4.0
TippingPoint: 🔍
ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍

Timelineinfo

02/01/1990 🔍
03/01/1992 +759 days 🔍
03/01/1992 +0 days 🔍
03/01/1992 +0 days 🔍
03/05/1992 +4 days 🔍
10/08/2002 +3869 days 🔍
04/09/2004 +548 days 🔍
06/16/2014 +3720 days 🔍
04/16/2026 +4322 days 🔍

Sourcesinfo

Vendor: ibm.com

Advisory: securitydigest.org
Organization: CERT/CC
Status: Confirmed

CVE: CVE-1999-0627 (🔍)
GCVE (CVE): GCVE-0-1999-0627
GCVE (VulDB): GCVE-100-13643
X-Force: 101
SecurityFocus: 37 - AIX rexd Vulnerability
OSVDB: 11450 - rexd Service Authentication Bypass Remote Command Execution
Vulnerability Center: 20 - rexd RPC Service Weak Authentication, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 06/16/2014 15:30
Updated: 04/16/2026 04:11
Changes: 06/16/2014 15:30 (61), 01/14/2018 10:25 (14), 04/03/2025 05:35 (19), 10/25/2025 21:54 (2), 04/16/2026 04:11 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!