CVE-2017-17517
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 · uneditedlibsylph/utils.c in Sylpheed through 3.6 does not validate strings before launching the program specified by the BROWSER environment variable, which might allow remote attackers to conduct argument-injection attacks via a crafted URL.
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 · high confidenceThe vulnerability exists in libsylph/utils.c where Sylpheed uses the BROWSER environment variable to determine which browser to invoke for opening URLs. The code fails to validate or sanitize strings before passing them to the browser launch mechanism, enabling argument injection where a crafted URL can embed additional command-line arguments that get executed by the browser program.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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<= 3.6CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Sylpheed installation and versionRun 'sylpheed --version' or check your package manager (dpkg -l | grep sylpheed, rpm -qa | grep sylpheed) to determine the installed versionAffected if The installed version is 3.6 or lower
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Check if BROWSER environment variable is setRun 'echo $BROWSER' in the shell where Sylpheed runs, or inspect environment variables via /proc/<sylpheed_pid>/environAffected if The BROWSER variable contains a value (is not empty)
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Verify the vulnerable code path is reachableCheck if Sylpheed is configured to use external browsers - look in ~/.sylpheed-2.0/prefsrc or similar config for 'ext_program' or 'browser' settings, or attempt to open a URL through Sylpheed and observe if it invokes an external browserAffected if Sylpheed is set to use an external browser program via the BROWSER variable
You are affected if Sylpheed version 3.6 or lower is installed, the BROWSER environment variable is set, and Sylpheed is configured to invoke external browsers through that variable.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataImplement strict input validation for the BROWSER environment variable and URL parameters, ensuring only expected/allowed characters are permitted and properly escaping or rejecting special characters that could be interpreted as arguments. Users should also avoid opening untrusted URLs and ensure the BROWSER variable is not set to untrusted values.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-17517 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2017-17517 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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