Denial of service in wolfSSL
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-3336 |
| CWE-ID | CWE-399 CWE-20 CWE-401 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
wolfSSL Universal components / Libraries / Libraries used by multiple products |
| Vendor | wolfSSL |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
Updated: 16.02.2021
Changed bulletin status to patched, added vulnerabilities #2-3, updated bulletin title.
1) Resource management error
EUVDB-ID: #VU50255
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3336
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the DoTls13CertificateVerify() function in tls13.c in wolfSSL continues to process requests after certain anomalous peer behavior, such as sending an
ED22519, ED448, ECC, or RSA signature without the corresponding
certificate. A remote attacker can abuse this behavior to consume additional system resources and cause denial of service conditions.
Install update from vendor's website.
Vulnerable software versionswolfSSL: 2.0.3 - 4.6.0
External linkshttp://github.com/wolfSSL/wolfssl/pull/3676
http://github.com/wolfSSL/wolfssl/releases/tag/v4.7.0-stable
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Input validation error
EUVDB-ID: #VU50735
Risk: Low
CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input when processing a crafted compressed ECC key with enabled custom ECC curves. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionswolfSSL: 4.0 - 4.6.0
External linkshttp://github.com/wolfSSL/wolfssl/releases/tag/v4.7.0-stable
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Memory leak
EUVDB-ID: #VU50736
Risk: Low
CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: N/A
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due memory leak with TLS 1.3 authenticated-only ciphers when TLS 1.3 early data is enabled. A section of the server hello could contains 16 bytes of uninitialized data when sent to the connected peer. A remote attacker can gain access to potentially sensitive information.
MitigationInstall updates from vendor's website.
Vulnerable software versionswolfSSL: 4.0 - 4.6.0
External linkshttp://github.com/wolfSSL/wolfssl/releases/tag/v4.7.0-stable
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
