| CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
|---|---|---|
| 4.1 | $0-$5k | 0.00 |
Summary
A vulnerability classified as problematic was found in Linux Kernel 2.6.32.63. Affected is the function proc_ns_follow_link. Such manipulation leads to input validation.
This vulnerability is documented as CVE-2014-0203. There is not any exploit available.
It is best practice to apply a patch to resolve this issue.
Details
A vulnerability, which was classified as problematic, has been found in Linux Kernel 2.6.32.63 (Operating System). Affected by this issue is the function proc_ns_follow_link. 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 availability.
The issue has been introduced in 12/03/2009. The weakness was released 06/23/2014 by Vladimir Davydov with Parallels as confirmed git commit (GIT Repository). The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2014-0203 since 12/03/2013. The exploitation is known to be easy. Local access is required to approach this attack. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The advisory points out:
We end up trying to kfree() nd.last.name on open("/mnt/tmp", O_CREAT) if /mnt/tmp is an autofs direct mount. The reason is that nd.last_type is bogus here; we want LAST_BIND for everything of that kind and we get LAST_NORM left over from finding parent directory.
The vulnerability was handled as a non-public zero-day exploit for at least 1663 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 77489 (Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-2333-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 195598 (Ubuntu Security Notification for Linux-ec2 Vulnerabilities (USN-2333-1)).
Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:
nd->last_type = LAST_BIND;
The vulnerability is also documented in the databases at X-Force (93913), Tenable (77489), SecurityFocus (BID 68125†), Secunia (SA59309†) and Vulnerability Center (SBV-45165†). Entries connected to this vulnerability are available at VDB-11315, VDB-12411, VDB-13189 and VDB-13190. If you want to get best quality of vulnerability data, you may have to visit VulDB.
Product
Type
Vendor
Name
Version
License
Website
- Vendor: https://www.kernel.org/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔍VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 4.7VulDB Meta Temp Score: 4.5
VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 5.5
NVD Vector: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
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| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Input validationCWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍
Physical: Partially
Local: Yes
Remote: No
Availability: 🔍
Status: Unproven
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Nessus ID: 77489
Nessus Name: Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-2333-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍
Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Patch: git.kernel.org
Timeline
12/03/2009 🔍12/03/2013 🔍
05/05/2014 🔍
05/05/2014 🔍
06/23/2014 🔍
06/23/2014 🔍
06/23/2014 🔍
06/29/2014 🔍
09/03/2014 🔍
03/17/2015 🔍
08/01/2021 🔍
Sources
Vendor: kernel.orgAdvisory: git.kernel.org
Researcher: Vladimir Davydov
Organization: Parallels
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2014-0203 (🔍)
GCVE (CVE): GCVE-0-2014-0203
GCVE (VulDB): GCVE-100-43526
OVAL: 🔍
X-Force: 93913 - Linux Kernel proc_ns_follow_link() denial of service, Low Risk
SecurityFocus: 68125 - Linux Kernel 'mm/slab.c' Local Denial of Service Vulnerability
Secunia: 59309
Vulnerability Center: 45165 - Linux kernel before 2.6.33 Local DoS via an Open System Call, Medium
See also: 🔍
Entry
Created: 03/17/2015 12:19Updated: 08/01/2021 15:44
Changes: 03/17/2015 12:19 (77), 05/31/2017 13:12 (6), 08/01/2021 15:31 (3), 08/01/2021 15:37 (11), 08/01/2021 15:44 (1)
Complete: 🔍
Cache ID: 216:561:103
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