Full Report
saw this in my RSS reader, the null poison byte makes a comeback! Until it gets fixed, you can view here.
Analysis Summary
# Vulnerability: Null Poison Byte Return in Adobe Shockwave Link Handling
## CVE Details
- CVE ID: *Information not explicitly provided in the source article.*
- CVSS Score: *Score not explicitly provided in the source article.*
- CWE: *CWE not explicitly provided in the source article.*
## Affected Systems
- Products: Adobe Shockwave Player (Implied target based on the provided link structure)
- Versions: *Specific vulnerable versions not listed.*
- Configurations: Systems where external links/downloads referencing Shockwave are processed and parsed insecurely.
## Vulnerability Description
The vulnerability involves the re-emergence or persistence of an issue related to the **null poison byte** characters (`%00`). The linked example suggests that the download URL handler for Adobe Shockwave is vulnerable to path traversal when processing specially crafted URLs, allowing an attacker to append a null byte to potentially trick the application into interpreting the subsequent path segment (e.g., `/etc/passwd%00`) as the end of the filename or resource name. This technique is commonly used to bypass input validation mechanisms that terminate strings prematurely upon encountering a null byte.
## Exploitation
- Status: **PoC available** (The article explicitly shows an exploit URL structure).
- Complexity: *Complexity not explicitly stated, but path traversal/null byte injection is often Low complexity.*
- Attack Vector: **Network** (Through delivery of a malicious link/download request).
## Impact
- Confidentiality: Potential disclosure of sensitive files (e.g., `/etc/passwd` shown in example).
- Integrity: Potential to affect file writing operations if the vulnerability allows writing (though the example targets reading).
- Availability: Low to Medium, depending on the resultant crash or resource exhaustion.
## Remediation
### Patches
- *Specific patch details unavailable from the source text. The text implies the vulnerability "Until it gets fixed."*
### Workarounds
- Since the context points to an insecure download mechanism for Shockwave, a primary workaround would be to disable or uninstall the Adobe Shockwave Player until a vendor patch can be applied.
- Strict control over external links processed by the browser/application environment that triggers the Shockwave handler.
## Detection
- Indicators of Compromise: Network traffic containing URLs appended with uncommonly placed `%00` sequences directed towards download handlers for Adobe products.
- Detection methods and tools: Web proxy logs or network monitoring tools inspecting HTTP requests for URL encoding anomalies, specifically null byte placement in paths intended for file handling.
## References
- Vendor advisories: *None provided.*
- Relevant links - defanged:
- `http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=../../../../../../../../..//etc/passwd%00` (Defanged example link)