Skype up to 3.8.0.95 input validation

CVSS Meta Temp Score
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CTI Interest Score
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9.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Skype up to 3.8.0.95. It has been declared as critical. Affected by this issue is some unknown functionality. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2008-1805. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Skype up to 3.8.0.95 (Unified Communication Software) and classified as critical. Affected by this issue is some unknown processing. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Incomplete blacklist vulnerability in Skype 3.6.0.248, and other versions before 3.8.0.139, allows user-assisted remote attackers to bypass warning dialogs and possibly execute arbitrary code via a file: URI that ends in an executable extension that is not covered by the blacklist.

The bug was discovered 06/04/2008. The weakness was disclosed 06/06/2008 by Ismael Briones (Website). The advisory is shared for download at skype.com. This vulnerability is handled as CVE-2008-1805 since 04/15/2008. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 33125 (Skype file: URI Handling Security Bypass Arbitrary Code Execution (uncredentialed check)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115823 (Skype File URI Code Execution Vulnerability).

Upgrading to version 3.8.0.96 eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (42843), Tenable (33125), SecurityFocus (BID 29553†), OSVDB (46010†) and Secunia (SA30547†). The entry VDB-42695 is pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
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Nessus ID: 33125
Nessus Name: Skype file: URI Handling Security Bypass Arbitrary Code Execution (uncredentialed check)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Skype 3.8.0.96

Timelineinfo

04/15/2008 🔍
06/04/2008 +50 days 🔍
06/04/2008 +0 days 🔍
06/04/2008 +0 days 🔍
06/06/2008 +2 days 🔍
06/06/2008 +0 days 🔍
06/06/2008 +0 days 🔍
06/06/2008 +0 days 🔍
06/08/2008 +2 days 🔍
03/16/2015 +2472 days 🔍
05/31/2025 +3729 days 🔍

Sourcesinfo

Advisory: skype.com
Researcher: Ismael Briones
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2008-1805 (🔍)
GCVE (CVE): GCVE-0-2008-1805
GCVE (VulDB): GCVE-100-42692

OVAL: 🔍

X-Force: 42843
SecurityFocus: 29553 - Skype 'file://' URI Handler Bypass Remote Code Execution Vulnerability
Secunia: 30547
OSVDB: 46010 - Skype file: URI handler case-sensitive comparison security bypass
SecurityTracker: 1020201
Vulnerability Center: 18541 - Skype Before 3.8.0.139 Incomplete Blacklist Vulnerability Allows Remote Code Execution, Medium
Vupen: ADV-2008-1749

scip Labs: https://www.scip.ch/en/?labs.20140918
See also: 🔍

Entryinfo

Created: 03/16/2015 17:00
Updated: 05/31/2025 22:41
Changes: 03/16/2015 17:00 (68), 08/11/2019 09:51 (11), 05/31/2025 22:41 (18)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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