PT-2021-19829 · Emissary · Emissary

Pwntester · Published 2021-05-28 · Updated 2022-07-02 · CVE-2021-32647

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Emissary (affected versions not specified)

Description The issue affects Emissary, a P2P based data-driven workflow engine, allowing post-authentication Remote Code Execution (RCE). The "CreatePlace" REST endpoint is vulnerable, accepting an sppClassName parameter to load an arbitrary class, which can be instantiated with a specific constructor signature. An attacker may find a gadget class in the application classpath to achieve RCE, disrupt the application, crash it, or leak sensitive data.

Recommendations As a temporary workaround, consider disabling network access to Emissary from untrusted sources. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Special Elements Injection

Weakness Enumeration

CWE-74

CWE-470

Related Identifiers

CVE-2021-32647

GHSA-PH73-7V9R-WG32

Affected Products

Emissary

References · 4

• 🔥 https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604a929939fb9f66868382/src/main/java/emissary/server/mvc/internal/CreatePlaceAction.java#L36 · Exploit
• https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-ph73-7v9r-wg32 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-32647 · Security Note
• https://osv.dev/vulnerability/CVE-2021-32647 · Vendor Advisory