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SSA-712929 PUBLISHED CVSS 7.5 HIGH

The BN_mod_sqrt() function in openSSL, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli. Internally this function is used when parsing certificates that contain elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form. It is possible to trigger the infinite loop by crafting a certificate that has invalid explicit curve parameters. Since certificate parsing happens prior to verification of the certificate signature, any process that parses an externally supplied certificate may thus be subject to a denial of service attack. The infinite loop can also be reached when parsing crafted private keys as they can contain explicit elliptic curve parameters.

Risk Scores

CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

VendorProductVersions
SiemensSCALANCE XR326-2C PoE WG (without UL) (6GK5326-2QS00-3RR3)
SiemensSCALANCE XR324-12M (230V, ports on rear) (6GK5324-0GG10-3HR2)
SiemensSIMATIC S7-1500 CPU 1512C-1 PN (6ES7512-1CK01-0AB0)
SiemensSIMATIC S7-1500 CPU 1517TF-3 PN/DP (6ES7517-3UP00-0AB0)
SiemensSCALANCE X201-3P IRT PRO (6GK5201-3JR00-2BA6)
SiemensSCALANCE W761-1 RJ45 (6GK5761-1FC00-0AA0)
SiemensSCALANCE W788-2 M12 (6GK5788-2GD00-0AA0)
SiemensSIPLUS S7-1200 CPU 1212C AC/DC/RLY (6AG1212-1BE40-2XB0)
SiemensSCALANCE XC224-4C G EEC (6GK5224-4GS00-2FC2)
SiemensSIPLUS S7-1500 CPU 1516-3 PN/DP TX RAIL (6AG2516-3AN01-4AB0)
SiemensSIPLUS NET SCALANCE X202-2P IRT (6AG1202-2BH00-2BA3)
SiemensSCALANCE X204-2LD TS (6GK5204-2BC10-2CA2)
SiemensSCALANCE XR324-4M PoE (230V, ports on front) (6GK5324-4QG00-3AR2)
SiemensSIMATIC NET PC Software V17
SiemensSIMATIC S7-1500 CPU 1515-2 PN (6ES7515-2AM01-0AB0)
SiemensSIPLUS S7-1500 CPU 1516-3 PN/DP (6AG1516-3AN02-2AB0)
SiemensSIPLUS S7-1200 CPU 1215 DC/DC/RLY (6AG1215-1HG40-4XB0)
SiemensSCALANCE XF204-2 (6GK5204-2BC00-2AF2)
SiemensSIMATIC S7-1500 ET 200pro: CPU 1513PRO F-2 PN (6ES7513-2GL00-0AB0)
SiemensRUGGEDCOM ROX RX1501

…and 565 more

Timeline

References

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