The Datadog PHP Tracer provides application performance monitoring and distributed tracing for PHP. Prior to 1.19.2, ddtrace_deserialize_baggage in ext/distributed_tracing_headers.c parses incoming W3C baggage HTTP headers without enforcing DD_TRACE_BAGGAGE_MAX_ITEMS or DD_TRACE_BAGGAGE_MAX_BYTES. A remote unauthenticated client can send an arbitrarily large number of comma-separated key-value pairs or a single oversized value, causing the tracer to allocate hash-map entries and consume unbounded CPU and memory on each request.
Baggage extraction is enabled by default in most affected deployments unless baggage is removed from DD_TRACE_PROPAGATION_STYLE or DD_TRACE_PROPAGATION_STYLE_EXTRACT. This issue is fixed in version 1.19.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://github.com/DataDog/dd-trace-php/commit/2f7987eb02e306bb62bce8ec4152dece…
security-advisories@github.com
https://github.com/DataDog/dd-trace-php/commit/43072ccafe55a5dbdfba75a42bf316b4…
security-advisories@github.com
https://github.com/DataDog/dd-trace-php/pull/3854
security-advisories@github.com
https://github.com/DataDog/dd-trace-php/releases/tag/1.19.2
security-advisories@github.com
https://github.com/DataDog/dd-trace-php/releases/tag/1.20.0
security-advisories@github.com
https://github.com/DataDog/dd-trace-php/security/advisories/GHSA-phwx-ww2p-cv9v
security-advisories@github.com