Microsoft Internet Explorer 4.0/4.0.1/4.0.3/5.0 HHOpen ActiveX OLE Control hhopen.ocx memory corruption

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.
5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft Internet Explorer 4.0/4.0.1/4.0.3/5.0 and classified as critical. Affected by this issue is some unknown functionality of the file hhopen.ocx of the component HHOpen ActiveX OLE Control. The manipulation results in memory corruption. This vulnerability was named CVE-1999-1577. The attack may be performed from remote. In addition, an exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft Internet Explorer 4.0/4.0.1/4.0.3/5.0 (Web Browser). It has been classified as critical. Affected is an unknown code of the file hhopen.ocx of the component HHOpen ActiveX OLE Control. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.

The issue has been introduced in 04/01/1997. The weakness was presented 10/31/1999 as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability is traded as CVE-1999-1577 since 04/21/2005. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 943 days. During that time the estimated underground price was around $25k-$100k.

Upgrading to version 6 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (3314), Exploit-DB (19521) and SecurityFocus (BID 669†). See VDB-14930 and VDB-14929 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Support

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Internet Explorer 6

Timelineinfo

04/01/1997 🔍
09/27/1999 +909 days 🔍
10/31/1999 +34 days 🔍
10/31/1999 +0 days 🔍
04/21/2005 +1999 days 🔍
06/22/2014 +3349 days 🔍
02/28/2025 +3904 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: kb.cert.org
Status: Confirmed

CVE: CVE-1999-1577 (🔍)
GCVE (CVE): GCVE-0-1999-1577
GCVE (VulDB): GCVE-100-14928
CERT: 🔍
X-Force: 3314 - Microsoft Internet Explorer Hhopen buffer overflow
SecurityFocus: 669 - Microsoft hhopen OLE Control Buffer Overflow Vulnerability

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

Entryinfo

Created: 06/22/2014 14:14
Updated: 02/28/2025 10:46
Changes: 06/22/2014 14:14 (47), 04/07/2017 12:06 (17), 11/12/2024 15:45 (16), 02/28/2025 10:46 (2)
Complete: 🔍
Cache ID: 216:7FE:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!