OpenBSD OpenSSH up to 3.7.1 buffer.c buffer_append_space memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in OpenBSD OpenSSH up to 3.7.1 (Connectivity Software). It has been rated as very critical. This issue affects the function buffer_append_space of the file buffer.c of the component OpenSSH. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability.

The bug was discovered 09/16/2003. The weakness was disclosed 09/16/2003 by Solar Designer with OpenSSH Team (Website). It is possible to read the advisory at The identification of this vulnerability is CVE-2003-0693 since 08/14/2003. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/01/2024).

We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 14072 (Mandrake Linux Security Advisory : openssh (MDKSA-2003:090-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Mandriva Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38217 (OpenSSH Multiple Memory Management Vulnerabilities).

Upgrading to version 3.7.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (13191), Tenable (14072), SecurityFocus (BID 8628†), OSVDB (2557†) and Secunia (SA9743†). is providing further details.







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
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Class: Memory corruption
CWE: CWE-119

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Nessus ID: 14072
Nessus Name: Mandrake Linux Security Advisory : openssh (MDKSA-2003:090-1)
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OpenVAS ID: 53697
OpenVAS Name: Debian Security Advisory DSA 382-1 (ssh)
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Threat Intelligenceinfo

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Recommended: Upgrade
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Upgrade: OpenSSH 3.7.1


08/14/2003 🔍
09/16/2003 +33 days 🔍
09/16/2003 +0 days 🔍
09/16/2003 +0 days 🔍
09/16/2003 +0 days 🔍
09/16/2003 +0 days 🔍
09/16/2003 +0 days 🔍
09/17/2003 +0 days 🔍
09/22/2003 +5 days 🔍
09/22/2003 +0 days 🔍
09/24/2003 +2 days 🔍
07/31/2004 +311 days 🔍
07/01/2024 +7275 days 🔍



Researcher: Solar Designer
Organization: OpenSSH Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2003-0693 (🔍)

X-Force: 13191 - OpenSSH large packet buffer overflow, High Risk
SecurityFocus: 8628 - OpenSSH Buffer Mismanagement Vulnerabilities
Secunia: 9743 - OpenSSH "buffer_append_space()" Buffer Management Vulnerability, Highly Critical
OSVDB: 2557 - OpenSSH Multiple Buffer Management Multiple Overflows
Vulnerability Center: 2174 - [cisco-sa-20030917-openssh] OpenSSH <3.7.1 Buffer Management Error in buffer_append_space Function, Critical

Misc.: 🔍


Created: 09/16/2003 10:57 PM
Updated: 07/01/2024 02:33 PM
Changes: 09/16/2003 10:57 PM (103), 06/26/2019 03:03 PM (2), 03/08/2021 05:43 PM (2), 07/01/2024 02:33 PM (16)
Complete: 🔍
Cache ID: 44:AA9:40


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