Simon Tatham PuTTY up to 0.54 SSH Connection Attempt heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

A vulnerability, which was classified as critical, was found in Simon Tatham PuTTY up to 0.54 (Connectivity Software). This affects an unknown function of the component SSH Connection Attempt Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow (1) remote attackers to execute arbitrary code via an SSH2 packet with a base argument that is larger than the mod argument, which causes the modpow function to write memory before the beginning of its buffer, and (2) remote malicious servers to cause a denial of service (client crash) and possibly execute arbitrary code via a large bignum during authentication.

The bug was discovered 08/04/2004. The weakness was disclosed 08/04/2004 by CORE Security with Core Security Technologies (Website). The advisory is shared at chiark.greenend.org.uk. This vulnerability is uniquely identified as CVE-2004-1440 since 02/13/2005. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but an exploit is available.

After 6 hours, there has been an exploit disclosed. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 14560 (GLSA-200408-04 : PuTTY: Pre-authentication arbitrary code execution), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at chiark.greenend.org.uk. 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 (16885) and Tenable (14560). Further details are available at chiark.greenend.org.uk.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
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CVSSv2info

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Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

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Nessus ID: 14560
Nessus Name: GLSA-200408-04 : PuTTY: Pre-authentication arbitrary code execution
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 54634
OpenVAS Name: Gentoo Security Advisory GLSA 200408-04 (PuTTY)
OpenVAS File: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Patch: chiark.greenend.org.uk

Timelineinfo

08/04/2004 🔍
08/04/2004 +0 days 🔍
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08/05/2004 +0 days 🔍
08/18/2004 +13 days 🔍
08/30/2004 +12 days 🔍
12/31/2004 +123 days 🔍
12/31/2004 +0 days 🔍
02/13/2005 +44 days 🔍
06/29/2019 +5249 days 🔍

Sourcesinfo

Advisory: chiark.greenend.org.uk
Researcher: CORE Security
Organization: Core Security Technologies
Status: Not defined
Confirmation: 🔍

CVE: CVE-2004-1440 (🔍)
X-Force: 16885 - PuTTY allows attacker to execute arbitrary code, High Risk
Vulnerability Center: 5118 - PuTTY Client Wrong Modpow Integer Handling Enables Code Execution, Medium
SecurityFocus: 10850 - PuTTY Modpow Integer Handling Memory Corruption Vulnerability
Secunia: 12212 - PuTTY Authentication Process Buffer Overflow Vulnerabilities, Moderately Critical
OSVDB: 8299 - PuTTY modpow() Pre-authentication Arbitrary Code Execution

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

Entryinfo

Created: 08/04/2004 13:31
Updated: 06/29/2019 06:38
Changes: 08/04/2004 13:31 (98), 06/29/2019 06:38 (2)
Complete: 🔍

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