Описание
Rekor has an OOM Condition due to Unbounded gzip Decompression in Alpine APK Parsing Logic
Description
The Package.Unmarshal() function in pkg/types/alpine/apk.go decompresses the signature and control gzip members of an APK file into in-memory buffers without bounding the total decompressed size. The existing max_apk_metadata_size check (default 1MB) is only applied to individual tar entry header sizes after decompression completes, so it does not prevent a decompression bomb from consuming unbounded heap memory.
An attacker can craft a gzip stream that compresses at a ~1000:1 ratio (e.g., 2MB compressed zeros → 2GB decompressed). When submitted as spec.package.content in an Alpine ProposedEntry, the server decompresses the full payload into memory during request processing, triggering a fatal Go runtime out-of-memory error or OS OOM-kill that cannot be caught by the server's recover() middleware.
This is reachable via two unauthenticated endpoints:
- POST /api/v1/log/entries (createLogEntry)
- POST /api/v1/log/entries/retrieve (searchLogQuery)
Both invoke V001Entry.Canonicalize() → fetchExternalEntities() → apk.Unmarshal(packageData), which performs the unbounded decompression.
Workarounds
There is no effective workaround. Setting max_request_body_size reduces but does not eliminate exposure due to the ~1000:1 compression ratio (a 1MB body limit still allows ~1GB heap allocation). Setting max_apk_metadata_size has no effect on this vulnerability since the check is applied after decompression.
Пакеты
github.com/sigstore/rekor
>= 0.3.0, < 1.5.2
1.5.2
Связанные уязвимости
A flaw was found in Rekor. The `Package.Unmarshal()` function, which processes Alpine Package Keep (APK) files, decompresses gzip streams without limiting the total decompressed size. A remote attacker can exploit this by crafting a malicious APK file with a high compression ratio, causing the server to consume excessive memory. This leads to a Denial of Service (DoS) through an out-of-memory (OOM) error, and can be triggered via unauthenticated API endpoints.
