CVE-2021-43857

published 2021-12-27

CVE-2021-43857: Gerapy is a distributed crawler management framework. Gerapy prior to version 0.9.8 is vulnerable to remote code execution, and this issue is patched in…

Priority P2 76 high 8.8 CVSS 3.1

AV N AC L PR L UI N S U C H I H A H

EXPLOIT

Gerapy is a distributed crawler management framework. Gerapy prior to version 0.9.8 is vulnerable to remote code execution, and this issue is patched in version 0.9.8.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
gerapy	gerapy	< 0.9.8	0.9.8
gerapy	gerapy	>= 0 < 49bcb19be5e0320e7e1535f34fe00f16a3cf3b28	49bcb19be5e0320e7e1535f34fe00f16a3cf3b28
gerapy	gerapy	>= 0 < 0.9.8	0.9.8

Detection & IOCs extracted from sources · hover to see the quote

url /api/user/auth↗

url /api/project/index↗

url /api/project/{name}/build↗

url /api/project/{id}/parse↗

• → Monitor for authenticated POST requests to the Gerapy API endpoint /api/project/<id>/parse — this is the sink where the RCE payload is delivered. ↗
• → Look for an Authorization header containing a bearer Token value on requests to /api/project/*/parse and /api/project/*/build, indicating an authenticated exploitation attempt. ↗

• · Exploitation requires valid credentials — the attacker must authenticate first to obtain a token before reaching the vulnerable /parse endpoint. Unauthenticated access alone is insufficient. ↗
• · The exploit targets Gerapy versions prior to 0.9.8 only; version 0.9.8 contains the patch. Ensure version detection is part of any scanning or triage workflow. ↗
• · The exploit requires at least one project to already exist in Gerapy (it enumerates the first project by name/ID). Instances with no configured projects may not be immediately exploitable via this specific PoC. ↗

CVSS provenance

nvd v3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 6.5 MEDIUM AV:N/AC:L/Au:S/C:P/I:P/A:P

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CWE-78