Cisco IOS/IOS XE TACACS+ Client Subsystem Crafted Packet input validation
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.8 | $0-$5k | 0.00 |
A vulnerability was found in Cisco IOS and IOS XE (Router Operating System) (affected version unknown). It has been classified as problematic. This affects an unknown functionality of the component TACACS+ Client Subsystem. The manipulation as part of a Crafted Packet leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:
A vulnerability in the TACACS+ client subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of crafted TACACS+ response packets by the affected software. An attacker could exploit this vulnerability by injecting a crafted TACACS+ packet into an existing TACACS+ session between an affected device and a TACACS+ server or by impersonating a known, valid TACACS+ server and sending a crafted TACACS+ packet to an affected device when establishing a connection to the device. To exploit this vulnerability by using either method, the attacker must know the shared TACACS+ secret and the crafted packet must be sent in response to a TACACS+ request from a TACACS+ client. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
The bug was discovered 09/26/2018. The weakness was released 10/05/2018 as cisco-sa-20180926-tacplus as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is uniquely identified as CVE-2018-15369 since 08/17/2018. 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. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/30/2020).
The vulnerability was handled as a non-public zero-day exploit for at least 9 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316349 (Cisco IOS and IOS XE Software TACACS+ Client Denial of Service Vulnerability(cisco-sa-20180926-tacplus)).
Upgrading eliminates this vulnerability.
Entry connected to this vulnerability is available at 124885.
Product
Type
Vendor
Name
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 6.0VulDB Meta Temp Score: 5.9
VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 6.8
NVD Vector: 🔍
CVSSv2
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍
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Exploiting
Class: Input validationCWE: CWE-20
ATT&CK: Unknown
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Qualys ID: 🔍
Qualys Name: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔍
Timeline
08/17/2018 🔍09/26/2018 🔍
09/26/2018 🔍
10/05/2018 🔍
10/05/2018 🔍
10/06/2018 🔍
03/30/2020 🔍
Sources
Vendor: cisco.comAdvisory: cisco-sa-20180926-tacplus
Status: Confirmed
CVE: CVE-2018-15369 (🔍)
OVAL: 🔍
SecurityFocus: 105426 - Cisco IOS and IOS XE Software CVE-2018-15369 Denial of Service Vulnerability
scip Labs: https://www.scip.ch/en/?labs.20150108
See also: 🔍
Entry
Created: 10/06/2018 11:02Updated: 03/30/2020 14:15
Changes: 10/06/2018 11:02 (67), 03/30/2020 14:15 (3)
Complete: 🔍
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