vulnerability / NVI-00017545 / Revision 1
scim_proto and kanidm_proto have an authenticated process abort via SCIM filter stack exhaustion
GitHub lists this reviewed advisory for scim_proto, kanidm_proto. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
scim_proto
source listed<= 1.9.2
### Summary A single unauthenticated `GET` to any `/scim/v1/...` endpoint with a `?filter=` query string of a few thousand nested parentheses (≈ 4–12 KB) drives the recursive-descent PEG parser past the worker thread's stack guard page. Rust responds to stack overflow with `std::process::abort()` — the entire `kanidmd` process exits. The parse runs inside axum's `Query` extractor, before any handler body and therefore before any ACL check. ### Details The SCIM filter grammar recurses on `(` and `not (` with no depth bound. **`proto/src/scim_v1/mod.rs:263-433`** — `peg::parser! { grammar scimfilter() ... }`: ```rust // line 281 "not" separator()+ "(" e:parse() ")" { ScimFilter::Not(Box::new(e)) } // line 293 "(" e:parse() ")" { e } ``` Both rules re-enter `parse()` without a depth counter. **`proto/src/scim_v1/mod.rs:442-447`** — `impl FromStr for ScimFilter` calls `scimfilter::parse(input)` directly on the raw string with no length or depth pre-check. **`proto/src/scim_v1/mod.rs:80-81`** — `ScimEntryGetQuery.filter` is `#[serde_as(as = "Option")]`, so deserialising the query struct invokes `ScimFilter::from_str` on attacker bytes. **Unaut
kanidm_proto
source listed<= 1.9.2
### Summary A single unauthenticated `GET` to any `/scim/v1/...` endpoint with a `?filter=` query string of a few thousand nested parentheses (≈ 4–12 KB) drives the recursive-descent PEG parser past the worker thread's stack guard page. Rust responds to stack overflow with `std::process::abort()` — the entire `kanidmd` process exits. The parse runs inside axum's `Query` extractor, before any handler body and therefore before any ACL check. ### Details The SCIM filter grammar recurses on `(` and `not (` with no depth bound. **`proto/src/scim_v1/mod.rs:263-433`** — `peg::parser! { grammar scimfilter() ... }`: ```rust // line 281 "not" separator()+ "(" e:parse() ")" { ScimFilter::Not(Box::new(e)) } // line 293 "(" e:parse() ")" { e } ``` Both rules re-enter `parse()` without a depth counter. **`proto/src/scim_v1/mod.rs:442-447`** — `impl FromStr for ScimFilter` calls `scimfilter::parse(input)` directly on the raw string with no length or depth pre-check. **`proto/src/scim_v1/mod.rs:80-81`** — `ScimEntryGetQuery.filter` is `#[serde_as(as = "Option")]`, so deserialising the query struct invokes `ScimFilter::from_str` on attacker bytes. **Unaut
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-r5fr-9gmv-jggh ↗
GitHub Advisory Database · vendor advisory
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Public revision history
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- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.