ProFTPD up to 1.3.4 MKD/XMKD Command race condition

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5.7	$0-$5k	0.00

Summaryinfo

A vulnerability was found in ProFTPD up to 1.3.4. It has been declared as problematic. The affected element is an unknown function of the component MKD/XMKD Command Handler. Such manipulation leads to race condition. This vulnerability is traded as CVE-2012-6095. Furthermore, there is an exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in ProFTPD up to 1.3.4 (File Transfer Software). It has been rated as problematic. Affected by this issue is some unknown processing of the component MKD/XMKD Command Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:

ProFTPD before 1.3.5rc1, when using the UserOwner directive, allows local users to modify the ownership of arbitrary files via a race condition and a symlink attack on the (1) MKD or (2) XMKD commands.

The weakness was shared 11/08/2012 by TJ Saunders as Bug 3841 as not defined bug report (Website). The advisory is shared for download at bugs.proftpd.org. The public release happened without coordination with the vendor. This vulnerability is handled as CVE-2012-6095 since 12/06/2012. The exploitation is known to be easy. The attack may be launched remotely. Required for exploitation is a simple authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed by TJ Saunders in Shell-Skript and been published immediately after the advisory. The exploit is available at bugs.proftpd.org. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 66970 (ProFTPD FTP Command Handling Symlink Arbitrary File Overwrite), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FTP and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 121476 (Solaris 11.1 Support Repository Update (SRU) 11.4.0 Missing).

Upgrading to version 1.3.5rc1 eliminates this vulnerability. Applying the patch mkdir-bug3841.patch is able to eliminate this problem. The bugfix is ready for download at bugs.proftpd.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (66970), SecurityFocus (BID 57172†) and Secunia (SA51761†). The entry VDB-7456 is related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• File Transfer Software

Name

• ProFTPD

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9
• 1.2.10
• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3
• 1.3.4

License

• open-source

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

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: TJ Saunders
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 66970
Nessus Name: ProFTPD FTP Command Handling Symlink Arbitrary File Overwrite
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 892606
OpenVAS Name: Debian Security Advisory DSA 2606-1 (proftpd-dfsg - symlink race
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: 🔍
Exploit Delay Time: 🔍

Upgrade: ProFTPD 1.3.5rc1
Patch: mkdir-bug3841.patch

Timelineinfo

11/08/2012 🔍
11/08/2012 +0 days 🔍
11/08/2012 +0 days 🔍
12/06/2012 +27 days 🔍
12/28/2012 +22 days 🔍
01/08/2013 +10 days 🔍
01/24/2013 +16 days 🔍
06/24/2013 +151 days 🔍
12/24/2024 +4201 days 🔍

Sourcesinfo

Advisory: Bug 3841
Researcher: TJ Saunders
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2012-6095 (🔍)
GCVE (CVE): GCVE-0-2012-6095
GCVE (VulDB): GCVE-100-7244

OVAL: 🔍

SecurityFocus: 57172
Secunia: 51761 - ProFTPD Race Condition Privilege Escalation Security Issue, Less Critical

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

Entryinfo

Created: 01/08/2013 10:12
Updated: 12/24/2024 09:33
Changes: 01/08/2013 10:12 (82), 04/24/2019 10:14 (1), 04/20/2021 15:04 (4), 12/24/2024 09:33 (18)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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