جزئیات آسیب‌پذیری

Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow denial of service via NULL pointer dereference. X509V3_EXT_d2i(ext) returns NULL when an extension's DER value fails to parse. basicC, ia5string, and auth_att dereference its result without a NULL check. keyid_data also dereferences akid->keyid, which is NULL for an empty AKI SEQUENCE (DER 30 00) even when the parse succeeds. A caller invoking an affected helper on an extension from an untrusted certificate triggers a SIGSEGV that crashes the Perl process.

• https://github.com/dsully/perl-crypt-openssl-x509/commit/4c1e2370556097c253ae27abe9e1097ea377fbd2.patch patch
• https://metacpan.org/release/JONASBN/Crypt-OpenSSL-X509-2.1.3/source/Changes.md release-notes