High, CVSS 8.7PyPIAmendedPublished
SystemDS CPU exhaustion vulnerability
CVE-2022-26477 · GHSA-m43h-hfrq-x8wx
- Affected
- PyPI systemds < 2.2.2
- Fixed in
- 2.2.2· Vendor fix available
- Issue
- The Security Team noticed that the termination condition of the for loop in the readExternal method is a controllable variable, which, if tampered with, may lead to CPU exhaustion. As a fix, we added an upper bound and termination condition in the read and write logic. We classify it as a "low-priority but useful improvement". SystemDS is a distributed system and needs to serialize/deserialize data but in many code paths (e.g., on Spark broadcast/shuffle or writing to sequence files) the byte stream is anyway protected by additional CRC fingerprints. In this particular case though, the number of decoders is upper-bounded by twice the number of columns, which means an attacker would need to modify two entries in the byte stream in a consistent manner. By adding these checks robustness was strictly improved with almost zero overhead. These code changes are available in versions higher than 2.2.1.
Recommended action: Upgrade to 2.2.2 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.