CVE-2019-15945 — OpenSC before 0

OpenSC before 0.20.0-rc1 has an out-of-bounds access of an ASN.1 Bitstring in decode_bit_string in libopensc/asn1.c.

01What is this vulnerability?

OpenSC before 0.20.0-rc1 has an out-of-bounds access of an ASN.1 Bitstring in decode_bit_string in libopensc/asn1.c.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-09-05T16:07:03.000Z
• Last modified: 2024-08-05T01:03:32.577Z

09References

• github.com — https://github.com/OpenSC/OpenSC/commit/412a6142c27a5973c61ba540e33cdc22d5608e68
• github.com — https://github.com/OpenSC/OpenSC/compare/f1691fc...12218d4
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/09/msg00009.html
• www.openwall.com — http://www.openwall.com/lists/oss-security/2019/12/29/1
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2021/11/msg00027.html