File-policy bypass via malformed HTTP headers
Published Nov 15, 2024 · Updated Nov 15, 2024
Protection mechanism failure in Cisco UTD Snort IPS Engine Software and Firepower Threat Defense allows remote attackers to bypass HTTP file policies. The Snort HTTP detection engine incorrectly handles specific HTTP header parameters, allowing crafted packets to evade a configured file policy and carry a malicious payload through the device. Exploitation requires traffic to traverse an affected device with the Snort HTTP Detection Engine File Policy configured; no confidentiality or availability impact is reported.
Summary
What happened
Protection mechanism failure in Cisco UTD Snort IPS Engine Software and Firepower Threat Defense allows remote attackers to bypass HTTP file policies. The Snort HTTP detection engine incorrectly handles specific HTTP header parameters, allowing crafted packets to evade a configured file policy and carry a malicious payload through the device. Exploitation requires traffic to traverse an affected device with the Snort HTTP Detection Engine File Policy configured; no confidentiality or availability impact is reported.
The record
- CVE
- CVE-2021-1494
- Published
- Nov 15, 2024
- Updated
- Nov 15, 2024
- Vendor
- ClamAV
- Product
- Cisco UTD Snort IPS Engine Software
- Classifications
- CWE-693, T1562.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 15, 2024CVE publishedPublication date reported by the CVE source.
- Nov 15, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <16.12.5
- Affected versionversion=16.12.1a
- Affected versionversion=16.12.2
- Affected versionversion=16.12.3
- Affected versionversion=16.12.4
- Affected versionversion=16.6.1
- Affected versionversion=16.6.5
- Affected versionversion=16.6.6
- Affected versionversion=16.6.7a
- Affected versionversion=16.6.9
- Affected versionversion=17.1.1
- Affected versionversion=17.1 <17.3.3
- Affected versionversion=17.2.1r
- Affected versionversion=17.3.1a
- Affected versionversion=17.3.2
- Affected versionversion=17.4 <17.4.1
- Affected versionversion=3.17.0S
- Affected versionversion=3.17.1S
- Affected versionversion=Denali-16.3.3
- Affected versionversion=Denali-16.3.4
- Affected versionversion=Denali-16.3.5
- Affected versionversion=Denali-16.3.7
- Affected versionversion=Denali-16.3.9
- Affected versionversion=Everest-16.6.2
- Affected versionversion=Everest-16.6.3
- Affected versionversion=Everest-16.6.4
- Affected versionversion=Fuji-16.9.2
- Affected versionversion=Fuji-16.9.3
- Affected versionversion=Fuji-16.9.4
- Affected versionversion=Fuji-16.9.5
- Affected versionversion=Fuji-16.9.6
- Affected versionversion=Fuji-16.9.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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