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AUSCERT External Security Bulletin Redistribution
ESB-2018.2322
Cisco IOS and IOS XE Software Internet Key Exchange Version
1 RSA-Encrypted Nonces Vulnerability
14 August 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS
Cisco IOS XE
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0131
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180813-rsa-nonce
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Cisco IOS and IOS XE Software Internet Key Exchange Version 1 RSA-Encrypted
Nonces Vulnerability
Medium
Advisory ID: cisco-sa-20180813-rsa-nonce
First Published: 2018 August 13 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
CVE-2018-0131
CWE-326
CVSSÂ Score:
5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the implementation of RSA-encrypted nonces in Cisco IOS
Software and Cisco IOS XE Software could allow an unauthenticated, remote
attacker to obtain the encrypted nonces of an Internet Key Exchange
Version 1 (IKEv1) session.
The vulnerability exists because the affected software responds
incorrectly to decryption failures. An attacker could exploit this
vulnerability sending crafted ciphertexts to a device configured with
IKEv1 that uses RSA-encrypted nonces. A successful exploit could allow the
attacker to obtain the encrypted nonces.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180813-rsa-nonce
Affected Products
o Vulnerable Products
This vulnerability affects Cisco IOS Software and Cisco IOS XE Software
that is configured with the authentication rsa-encr option. For
information about affected software releases, consult the Cisco bug ID(s)
at the top of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that the vulnerability does not affect Cisco IOS XR
Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the
Cisco Technical Assistance Center (TAC) or their contracted maintenance
providers.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Dennis Felsch, Martin Grothe, and Jorg Schwenk
from Ruhr-Universitat Bochum, as well as Adam Czubak and Marcin Szymanek
from University of Opole, for reporting this vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180813-rsa-nonce
Revision History
o +----------+---------------------------+----------+--------+-----------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2018-August-13 |
+----------+---------------------------+----------+--------+-----------------+
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