Mine was not the first such"secondary code injection" attack. It was a consequence of exploring a PoC by MiG for a buffer overflow vulnerability in bash, where in a tall directory tree would overflow bash when you try to cd into that directory and you have the pwd set to be part of your prompt. At the time, it did not occur to me that it was a special kind of buffer overflow.
Crispin
Gunter Ollmann wrote:
Hi list,
NGS Software is pleased to make available a new whitepaper about second-order code injection attacks.
Abstract: "Many forms of code injection targeted at web-based applications (for instance cross-site scripting and SQL injection) rely upon the instantaneous execution of the embedded code to carry out the attack (e.g. stealing a user's current session information or executing a modified SQL query). In some cases it may be possible for an attacker to inject their malicious code into a data storage area that may be executed at a later date or time. Depending upon the nature of the application and the way the malicious data is stored or rendered, the attacker may be able to conduct a second-order code injection attack.
A second-order code injection attack can be classified as the process in which malicious code is injected into a web-based application and not immediately executed, but instead is stored by the application (e.g. temporarily cached, logged, stored in a database) and then later retrieved, rendered and executed by the victim."
The paper can be accessed from: http://www.nextgenss.com/papers/SecondOrderCodeInjection.pdf
Cheers,
Gunter
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G u n t e r O l l m a n n, MSc(Hons), BSc
Professional Services Director Next Generation Security Software Ltd. First Floor, 52 Throwley Way Tel: +44 (0)208 401 0089
Sutton, Surrey, SM1 4BF, UK Fax: +44 (0)208 401 0076
http://www.nextgenss.com ------------------------------------------------------
-- Crispin Cowan, Ph.D. http://immunix.com/~crispin/ CTO, Immunix http://immunix.com
