Use-after-free in opensc (Alpine package)

1) Use-after-free

EUVDB-ID: #VU23846

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-19480

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the sc_pkcs15_decode_prkdf_entry() function in libopensc/pkcs15-prkey.c. A local user can pass specially crafted data to the application, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

opensc (Alpine package): 0.13.0-r0 - 0.19.0-r3

CPE2.3

• cpe:2.3:o:alpine:opensc_alpine_package:0.13.0-r0:*:*:*:*:alpine_linux:*:2.7
• cpe:2.3:o:alpine:opensc_alpine_package:0.14.0-r0:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:o:alpine:opensc_alpine_package:0.15.0-r0:*:*:*:*:alpine_linux:*:3.3

External links

https://git.alpinelinux.org/aports/commit/?id=dae98cd340ff7dc76ebb8d7cf1b949c488688a77
https://git.alpinelinux.org/aports/commit/?id=8a19072c6d6a326b70858085a9dc1d29861fb3da

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.