Summaryinfo

A vulnerability, which was classified as critical, was found in Cisco IOS XE. This affects an unknown part of the component Digital Signature Verification. The manipulation leads to signature verification. This vulnerability is uniquely identified as CVE-2018-15374. Local access is required to approach this attack. There is no exploit available. It is recommended to upgrade the affected component. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Cisco IOS XE (Router Operating System) (version now known). Affected by this issue is some unknown processing of the component Digital Signature Verification. The manipulation with an unknown input leads to a signature verification vulnerability. Using CWE to declare the problem leads to CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the Image Verification feature of Cisco IOS XE Software could allow an authenticated, local attacker to install a malicious software image or file on an affected device. The vulnerability is due to the affected software improperly verifying digital signatures for software images and files that are uploaded to a device. An attacker could exploit this vulnerability by uploading a malicious software image or file to an affected device. A successful exploit could allow the attacker to bypass digital signature verification checks for software images and files and install a malicious software image or file on the affected device.

The bug was discovered 09/26/2018. The weakness was released 10/05/2018 with Cisco as cisco-sa-20180926-digsig as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability is handled as CVE-2018-15374 since 08/17/2018. Local access is required to approach this attack. Required for exploitation is a simple authentication. The technical details are unknown and an exploit is not available.

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 316332 (Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability(cisco-sa-20180926-digsig)).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 105415†). Entries connected to this vulnerability are available at VDB-124884 and VDB-124883. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS XE

License

• commercial

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