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BblfshdApplication · Bblfshd Project

CVE-2021-32825

CRITICAL · 9.1 CVSS v3.1 Published 2021-08-16
Fix available
A fix is available. Upgrade to 2021-08-11 or later.
See remediation →
100/100
Remediation priority · Urgent
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
bblfshd is an open source self-hosted server for source code parsing. In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a "zipslip" vulnerability. The unsafe handling of symbolic links in an unpacking routine may enable attackers to read and/or write to arbitrary locations outside the designated target folder. This issue may lead to arbitrary file write (with same permissions as the program running the unpack operation) if the attacker can control the archive file. Additionally, if the attacker has read access to the unpacked files, he may be able to read arbitrary system files the parent process has permissions to read. For more details including a PoC see the referenced GHSL-2020-258.

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

A detailed technical summary for this CVE is being prepared.

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
BblfshdApplication
Affected:< 2021-08-11

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
None

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

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
Upgrade available Upgrade to 2021-08-11 or later
Fixed in 2021-08-11
Vendor patch github.com →
Recommended fix Moderate confidence

Any bblfshd release dated after 2021-08-11 (or version that includes commit 4265465b9b6fb5663c30ee43806126012066aad4)

  1. 1. Identify current bblfshd version by running 'bblfshd --version' or checking the Docker image tag
  2. 2. Upgrade to a version of bblfshd released after 2021-08-11, which includes the fix at commit 4265465b9b6fb5663c30ee43806126012066aad4
  3. 3. Alternatively, rebuild bblfshd from source ensuring the fix from commit 4265465b9b6fb5663c30ee43806126012066aad4 is included
  4. 4. After upgrade, verify the version is patched by checking release notes or git log for the fix commit
  5. 5. If using Docker, pull a newer image tag dated after 2021-08-11
  6. 6. Restart the bblfshd service to apply the patched version

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-2021-32825 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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