Stack-based buffer overflow in OpenSC

1) Stack-based buffer overflow

EUVDB-ID: #VU48689

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-26572

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in tcos_decipher. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions CPE2.3

External links

http://www.openwall.com/lists/oss-security/2020/11/24/4
http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22967
http://github.com/OpenSC/OpenSC/commit/9d294de90d1cc66956389856e60b6944b27b4817

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.