Vulnerability CVE-2021-36219
Published: 2021-09-27

Description:
An issue was discovered in SKALE sgxwallet 1.58.3. The provided input for ECALL 14 triggers a branch in trustedEcdsaSign that frees a non-initialized pointer from the stack. An attacker can chain multiple enclave calls to prepare a stack that contains a valid address. This address is then freed, resulting in compromised integrity of the enclave. This was resolved after v1.58.3 and not reproducible in sgxwallet v1.77.0.

Type:

CWE-824

 (Access of Uninitialized Pointer)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Skale -> Sgxwallet 

 References:
https://github.com/skalenetwork/sgxwallet/releases
https://github.com/skalenetwork/sgxwallet/commit/4e9b5b7526db083177e81f8bafeaa4914d276a82
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