Out-of-bounds read in opensc (Alpine package)

1) Out-of-bounds read

EUVDB-ID: #VU23845

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-15945

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when processing ASN.1 Bitstring within the decode_bit_string() function in libopensc/asn1.c. A local user can pass specially crafted data to the application, trigger out-of-bounds read error and read contents of memory on the 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.