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Heap overflow in RealPlayer ID3 tag parser

Name: Heap overflow in RealPlayer ID3 tag parsing code
Release Date: 29 October 2007
Reference: NGS00432
Discover: John Heasman <john@xxxxxxxxxxxxxxx>
Vendor: RealNetworks
Systems Affected: Several builds of RealPlayer 10.5,
 All builds of RealPlayer 10.
 For additional affected versions, see the URL below.
Risk: High
Status: Published

Discovered:  1 August 2006
Released:  1 August 2006
Approved:  1 August 2006
Reported:  1 August 2006
Fixed: 25 October 2007
Published: 29 October 2007

There is a heap overflow in the Realplayer code that parses ID3 tags in
MP3 files.

Impact: attackers could execute code of their choice on susceptible
systems if a user were induced to open a malicious MP3 file.

Technical Details
The problem stems from the parsing of a Lyrics3 v2.00 tag.  The size of
the tag is calculated by reading 5 ASCII characters and calling
pncrt.atoi.  A buffer is then allocated on the heap of size tag length +
1.  Since atoi parses a signed integer, supplying -1, results in a zero
length allocation into which data is copied.

This can be exploited to overwrite a function pointer leading to the
execution of arbitrary attacker-supplied code in the context of the user
under which RealPlayer is running.

Fix Information
This issue has now been resolved. Steps detailing how to update RealPlayer may be obtained from:


NGSSoftware Insight Security Research
+44(0)208 401 0070


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