Buffer overflow in OpenSC

1) Buffer overflow

EUVDB-ID: #VU35565

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-16058

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC. If a smart card creates a signature with a length longer than 256 bytes, this triggers a buffer overflow. This may be the case for RSA keys with 4096 bits depending on the signature scheme.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenSC: 0.2.0 - 0.3.0

CPE2.3

• cpe:2.3:a:opensc:opensc:0.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:opensc:opensc:0.3.0:*:*:*:*:*:*:*

External links

https://www.openwall.com/lists/oss-security/2019/09/12/1
https://github.com/OpenSC/pam_p11/commit/d150b60e1e14c261b113f55681419ad1dfa8a76c

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.