JVN#42883072
Kaitai Struct: compiler vulnerable to denial-of-service (DoS)
Overview
Kaitai Struct: compiler contains a denial-of-service (DoS) vulnerability.
Products Affected
- Kaitai Struct: compiler 0.9 and earlier
Description
Kaitai Struct: compiler provided by Kaitai team contains SnakeYAML library version 1.25, which is used in parsing .ksy files.
SnakeYAML version 1.25 expands recursive aliases unlimitedly (CWE-674), hence Katai Struct: compiler is vulnerable to a denial-of-service (DoS) attack by Billion Laughs Attack.
Impact
Processing untrusted .ksy files may cause a denial-of-service (DoS) condition.
Solution
Update the software
Update the software to the latest version according to the information provided by the developer.
According to the developer, this vulnerability has been fixed at version 0.10 by updating the bundled SnakeYAML library.
Vendor Status
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Credit
Taichi Kotake of Sterra Security Co.,Ltd. / Akatsuki Games Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2017-18640 |
| JVN iPedia |
JVNDB-2022-000062 |