Multiple Atlassian products contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or disclose sensitive information on a targeted system.
The vulnerability exists because the affected software fails to properly restrict the capabilities of a third-party XML parser while handling XML files. An unauthenticated, remote attacker could exploit the vulnerability by transmitting crafted SOAP requests to the system. Successful attacks could allow the attacker to access sensitive files on the system or cause a DoS condition.
Functional code that exploits the vulnerability in Atlassian Crowd is available as part of the Metasploit framework.
Atlassian has confirmed the vulnerability and software updates are available.
Indicators of Compromise
The following products are vulnerable:
Atlassian JIRA versions 5.0.0 and prior
Atlassian Confluence versions 4.1.9 and prior
Atlassian Crowd versions 2.4.0 and prior
Atlassian Bamboo versions 3.4.4 and prior
Atlassian FishEye and Crucible versions 2.7.11 and prior
The vulnerability is due to the way the affected software expands the XML entity while handling XML files. The software fails to restrict certain access to third-party XML parsers while they expand external entities with the SYSTEM identifier, which could allow access to arbitrary files on the targeted system.
An unauthenticated, remote attacker could exploit the vulnerability by transmitting crafted SOAP requests to the system. The SOAP Interface could incorrectly handle these requests and allow the attacker to obtain sensitive information or cause a DoS condition.
Authentication is not required to exploit the vulnerability; however, the attacker may need access to trusted, internal networks to be able to initiate application sessions with the system. This may limit the likelihood of a successful exploit.
Atlassian indicates the third-party plug-ins Gliffy and Tempo are also affected.
Administrators are advised to apply the appropriate updates.
Administrators are advised to review installed third-party plug-ins and update as necessary.
Administrators are advised to allow only trusted users to have network access.
Users should verify that unsolicited links are safe to follow.
Atlassian has released security advisories at the following links:
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.