Sense of Security - Security Advisory - SOS-13-003 security advisory
Release Date. 10-Sep-2013
Last Update. -
Vendor Notification Date. 27-Sep-2012
Product. Juniper Junos J-Web
Affected versions. All builds prior to 2013-02-28 are affected
Severity Rating. Medium
Impact. Privilege escalation
Attack Vector. From remote with read-only authentication
Solution Status. Vendor patch (not verified by SOS)
Disable J-Web or limit access
CVE reference. CVE - not yet assigned
The J-Web is a GUI based network management application used on Junos
devices. The web application is vulnerable to a remote code execution
vulnerability which permits privilege escalation. The file/jsdm/ajax
/port.php allows execution of arbitrary user supplied PHP code via the
rs POST parameter. Code executes with UID=0 (root) privileges, however
you are confined to a chroot. Privilege escalation can be achieved by
waiting for an administrator to log in and reading the contents of /tmp
to hijack their session.
Proof of Concept.
Code execution: Execute a command inside the Chroot:
Privilege escalation: Read /tmp and hijack a session
All Junos OS software releases built on or after 2013-02-28 have fixed
this specific issue. This fix has not been validated by SOS.
As a workaround disable J-Web, or limit access to only trusted hosts.
This issue is being tracked as PR 826518 and is visible on the Juniper
Customer Support website.
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