Cisco IOS 12.2SCH on uBR10000 Performance Routing Engine MPLS 6VPE Packet race condition

CVSS Meta Temp Score
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CTI Interest Score
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5.3$5k-$25k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Cisco IOS 12.2SCH on uBR10000. This issue affects some unknown processing of the component Performance Routing Engine. Performing a manipulation as part of MPLS 6VPE Packet results in race condition. This vulnerability is reported as CVE-2015-4203. No exploit exists.

Detailsinfo

A vulnerability was found in Cisco IOS 12.2SCH on uBR10000 (Router Operating System). It has been classified as problematic. This affects some unknown processing of the component Performance Routing Engine. The manipulation as part of a MPLS 6VPE Packet leads to a race condition vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

Race condition in Cisco IOS 12.2SCH in the Performance Routing Engine (PRE) module on uBR10000 devices, when NetFlow and an MPLS IPv6 VPN are configured, allows remote attackers to cause a denial of service (PXF process crash) by sending malformed MPLS 6VPE packets quickly, aka Bug ID CSCud83396.

The weakness was disclosed 06/23/2015 with Cisco as CSCud83396 as not defined advisory (Website). It is possible to read the advisory at tools.cisco.com. This vulnerability is uniquely identified as CVE-2015-4203 since 06/04/2015. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/21/2022).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at SecurityFocus (BID 75339†) and Vulnerability Center (SBV-50670†). The entries VDB-76048 and VDB-76046 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Vendor

Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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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: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/04/2015 🔍
06/22/2015 +18 days 🔍
06/22/2015 +0 days 🔍
06/23/2015 +1 days 🔍
06/23/2015 +0 days 🔍
06/23/2015 +0 days 🔍
06/24/2015 +1 days 🔍
05/21/2022 +2523 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: CSCud83396
Organization: Cisco
Status: Not defined

CVE: CVE-2015-4203 (🔍)
GCVE (CVE): GCVE-0-2015-4203
GCVE (VulDB): GCVE-100-76047
SecurityFocus: 75339 - Cisco IOS Software CVE-2015-4203 Denial of Service Vulnerability
SecurityTracker: 1032692
Vulnerability Center: 50670 - Cisco IOS Software on uBR10000 Series Routers Remote DoS due to a Race Condition, Medium

See also: 🔍

Entryinfo

Created: 06/24/2015 09:53
Updated: 05/21/2022 14:40
Changes: 06/24/2015 09:53 (60), 07/01/2017 08:06 (4), 05/21/2022 14:40 (3)
Complete: 🔍
Cache ID: 216:288:103

Be aware that VulDB is the high quality source for vulnerability data.

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