Title: Real Networks Helix Universal Server Remote Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
Helix Universal Server is a multiple type media server distributed and maintained by Real Networks. It is available for Unix, Linux, and Microsoft Windows platforms.
Real Networks has announced that a vulnerability is present in Helix Universal Server version 9 and prior that will allow for attackers to remotely compromise servers. The condition occurs when URLs containing an excessive number of '../' sequences are sent to the Server's protocol parsers. A remote attacker may pass a malicious request that is sufficient to overflow a 1024 byte buffer on the stack. Ultimately the attacker may influence execution flow into attacker controlled heap based memory. This will result in arbitrary attacker supplied instructions being executed in the context of the affected Helix server.
The vulnerability is reportedly present in the "View Source" plug-in and may be eliminated if the plug-in is disabled. The plug-in is used for reading and displaying file format header information of files accessible on the server filesystem. It also supports the "Content Browsing" feature, which will not function if the plug-in is disabled. Additionally, disabling the plug-in will not adversely affect on-demand or live streaming delivery or the logging and authentication services of the server.
It has been reported that exploitation of this issue is hindered somewhat on SPARC systems or other systems that are word aligned.
Note: The announcement by Real Networks may be related to issues reported earlier by Symantec (possibly BIDs 7020, 6454, 6458 or 6456). This has not been confirmed. However, if this is indeed the case, this BID will be retired.
Affected Products:
- Real Networks GameHouse dldisplay ActiveX control
- Real Networks Helix Universal Server 8.0.0 1
- Real Networks Helix Universal Server 9.0.0
- Real Networks Helix Universal Server 9.0.0 1
- Real Networks Helix Universal Server 9.0.2 .794
- Real Networks Real Server 5.0.0
- Real Networks Real Server 6.0.0 x
- Real Networks Real Server 7.0.0
- Real Networks Real Server 7.0.1
- Real Networks Real Server 7.0.2
- Real Networks Real Server 8.0.0
- Real Networks Real Server 8.0.0 1
- Real Networks Real Server 8.0.0 2
- Real Networks Real Server 8.0.0 Beta
References:
- CORE Security: My first IMPACT exploit
- CORE Security: RealServer array overflow exploit
- CORE Security: RealServer buffer overflow exploit
- RealNetworks: Server Exploit Fix
- RealNetworks: Server Exploit Vulnerability
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