Vulnerability identifier: #VU39994

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-6496

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Crowd
Server applications / Directory software, identity management

Vendor: Atlassian

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The LDAP directory connector in Atlassian Crowd before 2.8.8 and 2.9.x before 2.9.5 allows remote attackers to execute arbitrary code via an LDAP attribute with a crafted serialized Java object, aka LDAP entry poisoning.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Crowd: 2.9.0 - 2.9.1

---

External links
http://www.securityfocus.com/archive/1/539655/100/0/threaded
http://www.securityfocus.com/bid/93826
http://confluence.atlassian.com/crowd/crowd-security-advisory-2016-10-19-856697283.html
http://jira.atlassian.com/browse/CWD-4790
http://www.blackhat.com/docs/us-16/materials/us-16-Munoz-A-Journey-From-JNDI-LDAP-Manipulation-To-RCE-wp.pdf

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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