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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: GFI Kerio Control suffers from **HTTP Response Splitting**. ๐ **Consequences**: Attackers can inject malicious headers into 302 redirects.โฆ
๐ **Root Cause**: **CWE-113** (Improper Neutralization of CRLF Sequences in HTTP Headers). ๐ **Flaw**: The `Dest` parameter on certain pages is **not sanitized** before being used in HTTP response headers.โฆ
๐ข **Vendor**: GFI (Malta). ๐ฆ **Product**: Kerio Control (UTM Solution). ๐ **Affected**: Versions **9.2.5** and likely earlier. ๐ Includes features like Virus Protection & Web Filtering.
Q4What can hackers do? (Privileges/Data)
๐ **Attacker Actions**: Inject arbitrary HTTP headers. ๐ฏ **Impact**: High (CVSS H). Can execute **Cross-Site Scripting (XSS)**. Can **Poison Caches**. Can redirect users to malicious sites.โฆ
โ๏ธ **Threshold**: **Low** for Network (AV:N), **Low** for Complexity (AC:L). ๐ซ **Auth**: None required (PR:N). ๐ค **UI**: User Interaction Required (UI:R). ๐ **Verdict**: Easy to exploit if a user clicks a crafted link.
๐ **Self-Check**: Scan for **HTTP Response Splitting** patterns. ๐ ๏ธ **Tool**: Use Nuclei with the specific CVE-2024-52875 template. ๐ก **Indicator**: Look for abnormal `Dest` parameters in 302 responses.โฆ
๐ฉน **Fix**: Official patch is implied by the CVE publication date (Jan 2025). ๐ข **Action**: Check GFI/Kerio official security advisories for version updates.โฆ
๐ง **No Patch?**: Implement **WAF Rules** to block CRLF characters in `Dest` parameters. ๐ก๏ธ **Input Validation**: Sanitize all user inputs before header generation.โฆ