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SniproxyApplication · Sniproxy Project

CVE-2023-25076

CRITICAL · 9.8 CVSS v3.1 Published 2023-03-30
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
100/100
Remediation priority · Urgent
High EPSS Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A buffer overflow vulnerability exists in the handling of wildcard backend hosts of SNIProxy 0.6.0-2 and the master branch (commit: 822bb80df9b7b345cc9eba55df74a07b498819ba). A specially crafted HTTP or TLS packet can lead to arbitrary code execution. An attacker could send a malicious packet to trigger this vulnerability.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-120

A fixed-size buffer is filled without checking the length of the incoming data, so it overflows into neighbouring memory. This is the classic overflow attackers use to overwrite return addresses and hijack execution. The fix is strict length checks and safe, bounded string and memory functions.

General guidance for the classic buffer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
SniproxyApplication
Affected:= 0.6.0-2= 0.6.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

Any version after 0.6.1 that includes the fix commit f8d9a433fe22ab2fa15c00179048ab02ae23d583, or build from that commit

  1. 1. Identify the current Sniproxy version installed using package manager (e.g., `dpkg -l sniproxy` or `sniproxy -v`)
  2. 2. If running version 0.6.0-2 or 0.6.1, upgrade to a version incorporating the fix at commit f8d9a433fe22ab2fa15c00179048ab02ae23d583
  3. 3. On Debian systems, check for updated packages via `apt update && apt-cache policy sniproxy` and install available updates
  4. 4. Alternatively, build from source using the fixed commit: `git clone https://github.com/dlundquist/sniproxy.git && cd sniproxy && git checkout f8d9a433fe22ab2fa15c00179048ab02ae23d583 && ./autogen.sh && make && make install`
  5. 5. Restart the Sniproxy service after upgrade: `systemctl restart sniproxy` or `service sniproxy restart`
  6. 6. Verify the new version is running and service is healthy

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-25076 in production — separate from our analysis above.

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What this is

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