Security restrictions bypass in IBM Security Access Manager

1) XXE attack

EUVDB-ID: #VU10881

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1443

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to perform XXE attack and bypass security restrictions.

The vulnerability exists in SAML-based single sign-on (SSO) systems due to improper handling of XML External Entity (XXE) entries when parsing an XML file. A remote attacker can trick SAML systems into authenticating as a different user without knowledge of the victim users password and bypass security restrictions to perform further attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM Security Verify Access: 9.0.0 - 9.0.4

External links

http://www-01.ibm.com/support/docview.wss?uid=swg22014160

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.