CVE-2019-14584: Null Pointer Dereference
First published: Mon Oct 19 2020(Updated: )
AuthenticodeVerify() calls OpenSSLs d2i_PKCS7() API to parse asn encoded signed authenticode pkcs#7 data. when this successfully returns, a type check is done by calling PKCS7_type_is_signed() and then Pkcs7->d.sign->contents->type is used. It is possible to construct an asn1 blob that successfully decodes and have d2i_PKCS7() return a valid pointer and have PKCS7_type_is_signed() also return success but have Pkcs7->d.sign be a NULL pointer. Reference: <a href="https://bugzilla.tianocore.org/show_bug.cgi?id=1914">https://bugzilla.tianocore.org/show_bug.cgi?id=1914</a>
Credit: secure@intel.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Tianocore EDK2 | <2020-10-21 |
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Reference Links
- https://bugzilla.tianocore.org/show_bug.cgi?id=1914
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1889878
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1889877
- https://access.redhat.com/security/cve/CVE-2019-14584
- https://github.com/tianocore/edk2/commit/26442d11e620a9e81c019a24a4ff38441c64ba10
- https://bugzilla.redhat.com/show_bug.cgi?id=1889486
Frequently Asked Questions
What is CVE-2019-14584?
CVE-2019-14584 is a vulnerability that allows an authenticated user to potentially enable escalation of privilege via local access in Tianocore EDK2.
How severe is CVE-2019-14584?
CVE-2019-14584 has a severity value of 7.8, which is considered high.
Which software is affected by CVE-2019-14584?
Tianocore EDK2 versions up to and excluding 2020-10-21 are affected by CVE-2019-14584.
How can an authenticated user exploit CVE-2019-14584?
An authenticated user can potentially enable escalation of privilege via local access using CVE-2019-14584.
Is there a fix available for CVE-2019-14584?
It is recommended to update Tianocore EDK2 to a version after 2020-10-21 to mitigate CVE-2019-14584.
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