Description (en)
0day Rubbish Research Team is publicly disclosing a vulnerability in Plastic SCM (Unity Version Control On-Prem)
11.0.16.10303 (Unity Technologies). The research is published and a proof-of-concept is available.
Pre-authentication RCE (CVSS 9.8, pre-authentication)
Plastic SCM ships a self-developed binary version-control protocol on port 8087, reachable by default on 0.0.0.0. Under
the default NameWorkingMode, the server validates only that a client-declared username maps to a local OS account and
never checks a password; LocalGroupSEIDProvider.CheckPassword is an empty no-op. Combined with a default EVERYBODY ACL
that grants ALL_PERMISSIONS (including mktrigger) to any name-only-authenticated user, an unauthenticated attacker can
declare an administrative username (leaked unauthenticated via GetRepositoryServerInfo), create a server-side trigger
whose Path is fully attacker-controlled, and trigger it with a repository operation. TriggerProcess.ExecuteTrigger
feeds the Path straight into Process.Start as the FileName with no sandbox, path allowlist, or signature check,
yielding RCE as the plasticd service account (Linux: plasticscm uid=217; Windows: local Administrator). The only
non-network prerequisite is one local OS username, which the protocol itself leaks.
Impact: Full compromise of the version-control server and all repositories, and arbitrary command execution as the
plasticd service account; the attacker can read source code and repository metadata, create triggers, alter
repositories, and persist access.
Advisory: https://0day-rubbish.com/blog/plastic-scm-unauth-8087-rce
PoC and full analysis: https://github.com/Exploit-Garbage/0day-Rubbish
--
0day Rubbish Research Team
https://0day-rubbish.com
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
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"value": "0day Rubbish Research Team is publicly disclosing a vulnerability in Plastic SCM (Unity Version Control On-Prem) \n11.0.16.10303 (Unity Technologies). The research is published and a proof-of-concept is available.\n\nPre-authentication RCE (CVSS 9.8, pre-authentication)\n\nPlastic SCM ships a self-developed binary version-control protocol on port 8087, reachable by default on 0.0.0.0. Under \nthe default NameWorkingMode, the server validates only that a client-declared username maps to a local OS account and \nnever checks a password; LocalGroupSEIDProvider.CheckPassword is an empty no-op. Combined with a default EVERYBODY ACL \nthat grants ALL_PERMISSIONS (including mktrigger) to any name-only-authenticated user, an unauthenticated attacker can \ndeclare an administrative username (leaked unauthenticated via GetRepositoryServerInfo), create a server-side trigger \nwhose Path is fully attacker-controlled, and trigger it with a repository operation. TriggerProcess.ExecuteTrigger \nfeeds the Path straight into Process.Start as the FileName with no sandbox, path allowlist, or signature check, \nyielding RCE as the plasticd service account (Linux: plasticscm uid=217; Windows: local Administrator). The only \nnon-network prerequisite is one local OS username, which the protocol itself leaks.\n\nImpact: Full compromise of the version-control server and all repositories, and arbitrary command execution as the \nplasticd service account; the attacker can read source code and repository metadata, create triggers, alter \nrepositories, and persist access.\n\nAdvisory: https://0day-rubbish.com/blog/plastic-scm-unauth-8087-rce\n\nPoC and full analysis: https://github.com/Exploit-Garbage/0day-Rubbish\n\n-- \n0day Rubbish Research Team\nhttps://0day-rubbish.com\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives & RSS: https://seclists.org/fulldisclosure/"
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