GnuPG up to 1.4.5/1.9.95/2.0.2 Message 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.
6.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in GnuPG up to 1.4.5/1.9.95/2.0.2. It has been classified as critical. This issue affects some unknown processing of the component Message Handler. Performing a manipulation results in memory corruption. This vulnerability is identified as CVE-2006-6235. The attack can be initiated remotely. There is not any exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in GnuPG up to 1.4.5/1.9.95/2.0.2. This affects an unknown code block of the component Message Handler. 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. The summary by CVE is:

A "stack overwrite" vulnerability in GnuPG (gpg) 1.x before 1.4.6, 2.x before 2.0.2, and 1.9.0 through 1.9.95 allows attackers to execute arbitrary code via crafted OpenPGP packets that cause GnuPG to dereference a function pointer from deallocated stack memory.

The bug was discovered 12/06/2006. The weakness was released 12/06/2006 by Tavis Ormandy (@taviso) with Google Security Team (Website). The advisory is shared at lists.gnupg.org. This vulnerability is uniquely identified as CVE-2006-6235 since 12/02/2006. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 23794 (FreeBSD : gnupg -- remotely controllable function pointer (4db1669c-8589-11db-ac4f-02e081235dab)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 156234 (Oracle Enterprise Linux Update for GnuPG (ELSA-2006:0754)).

Upgrading to version 1.4.6 or 2.0.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at ftp.gnupg.org. The best possible mitigation is suggested to be patching the affected component. 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 (30711), Tenable (23794), SecurityFocus (BID 21462†), OSVDB (31832†) and Secunia (SA23290†). Entry connected to this vulnerability is available at VDB-2710. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• GnuPG

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.9.0
• 1.9.1
• 1.9.2
• 1.9.3
• 1.9.4
• 1.9.5
• 1.9.6
• 1.9.7
• 1.9.8
• 1.9.9
• 1.9.10
• 1.9.11
• 1.9.12
• 1.9.13
• 1.9.14
• 1.9.15
• 1.9.16
• 1.9.17
• 1.9.18
• 1.9.19
• 1.9.20
• 1.9.21
• 1.9.22
• 1.9.23
• 1.9.24
• 1.9.25
• 1.9.26
• 1.9.27
• 1.9.28
• 1.9.29
• 1.9.30
• 1.9.31
• 1.9.32
• 1.9.33
• 1.9.34
• 1.9.35
• 1.9.36
• 1.9.37
• 1.9.38
• 1.9.39
• 1.9.40
• 1.9.41
• 1.9.42
• 1.9.43
• 1.9.44
• 1.9.45
• 1.9.46
• 1.9.47
• 1.9.48
• 1.9.49
• 1.9.50
• 1.9.51
• 1.9.52
• 1.9.53
• 1.9.54
• 1.9.55
• 1.9.56
• 1.9.57
• 1.9.58
• 1.9.59
• 1.9.60
• 1.9.61
• 1.9.62
• 1.9.63
• 1.9.64
• 1.9.65
• 1.9.66
• 1.9.67
• 1.9.68
• 1.9.69
• 1.9.70
• 1.9.71
• 1.9.72
• 1.9.73
• 1.9.74
• 1.9.75
• 1.9.76
• 1.9.77
• 1.9.78
• 1.9.79
• 1.9.80
• 1.9.81
• 1.9.82
• 1.9.83
• 1.9.84
• 1.9.85
• 1.9.86
• 1.9.87
• 1.9.88
• 1.9.89
• 1.9.90
• 1.9.91
• 1.9.92
• 1.9.93
• 1.9.94
• 1.9.95
• 2.0.0
• 2.0.1
• 2.0.2

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 23794
Nessus Name: FreeBSD : gnupg -- remotely controllable function pointer (4db1669c-8589-11db-ac4f-02e081235dab)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 57709
OpenVAS Name: Debian Security Advisory DSA 1231-1 (gnupg)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: GnuPG 1.4.6/2.0.2
Patch: ftp.gnupg.org

Timelineinfo

12/02/2006 🔍
12/06/2006 +4 days 🔍
12/06/2006 +0 days 🔍
12/06/2006 +0 days 🔍
12/06/2006 +0 days 🔍
12/06/2006 +0 days 🔍
12/07/2006 +0 days 🔍
12/07/2006 +0 days 🔍
12/07/2006 +0 days 🔍
12/11/2006 +4 days 🔍
12/11/2006 +0 days 🔍
12/18/2006 +7 days 🔍
01/18/2025 +6606 days 🔍

Sourcesinfo

Advisory: lists.gnupg.org
Researcher: Tavis Ormandy (@taviso)
Organization: Google Security Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-6235 (🔍)
GCVE (CVE): GCVE-0-2006-6235
GCVE (VulDB): GCVE-100-2721

OVAL: 🔍

CERT: 🔍
X-Force: 30711 - GnuPG OpenPGP packet code execution, High Risk
SecurityFocus: 21462 - GnuPG OpenPGP Packet Processing Function Pointer Overwrite Vulnerability
Secunia: 23290 - Mandriva update for gnupg, Highly Critical
OSVDB: 31832 - GnuPG OpenPGP Packet Decryption Overflow
SecurityTracker: 1017349
Vulnerability Center: 13361 - GnuPG Function Pointer Dereference via OpenPGP Packets, High
Vupen: ADV-2006-4881

See also: 🔍

Entryinfo

Created: 12/11/2006 10:32
Updated: 01/18/2025 12:54
Changes: 12/11/2006 10:32 (105), 08/09/2019 15:35 (1), 01/18/2025 12:54 (16)
Complete: 🔍
Cache ID: 216:B98:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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