Apache Sling 2.1.0 Denial Of Service

2012.07.07

Credit: IO Active

Risk: Medium

Local: No

Remote: Yes

CVE: CVE-2012-2138

CWE: CWE-264

CVSS Base Score: 5/10

Impact Subscore: 2.9/10

Exploitability Subscore: 10/10

Exploit range: Remote

Attack complexity: Low

Authentication: No required

Confidentiality impact: None

Integrity impact: None

Availability impact: Partial

CVE-2012-2138 : Apache Sling denial of service vulnerability

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
org.apache.sling.servlets.post bundle up to 2.1.0

Description:
The @CopyFrom operation of the Sling POST servlet allows for copying a
parent node to one of its descendant nodes, creating an infinite loop
that ultimately results in denial of service, once memory and/or
storage resources are exhausted.

Mitigation:
Users should upgrade to version 2.1.2 of the
org.apache.sling.servlets.post bundle [1], or apply the Sling patch of
revision 1352865 [2].

Example:
curl -u admin:pwd -d "" "http://localhost:8888/content/foo/?./%40CopyFrom=../"

Credit:
This issue was discovered by IO Active, working for Adobe.

References:
[1] http://sling.apache.org/site/downloads.cgi
[2] http://svn.apache.org/viewvc?view=revision&revision=1352865
https://issues.apache.org/jira/browse/SLING-2517

References:

http://svn.apache.org/viewvc?view=revision&revision=1352865

https://issues.apache.org/jira/browse/SLING-2517

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Apache Sling 2.1.0 Denial Of Service

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