CVE-2024-0727 PKCS12 Decoding crashes

What is CVE-2024-0727?

CVE-2024-0727 is a medium-severity vulnerability in Openssl Openssl, published on 26 Jan 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Issue summary: Processing a maliciously formatted PKCS12 file may lead OpenSSL to crash leading to a potential Denial of Service attack

Impact summary: Applications loading files in the PKCS12 format from untrusted sources might terminate abruptly.

A file in PKCS12 format can contain certificates and keys and may come from an untrusted source. The PKCS12 specification allows certain fields to be NULL, but OpenSSL does not correctly check for this case. This can lead to a NULL pointer dereference that results in OpenSSL crashing. If an application processes PKCS12 files from an untrusted source using the OpenSSL APIs then that application will be vulnerable to this issue.

OpenSSL APIs that are vulnerable to this are: PKCS12_parse(), PKCS12_unpack_p7data(), PKCS12_unpack_p7encdata(), PKCS12_unpack_authsafes() and PKCS12_newpass().

We have also fixed a similar issue in SMIME_write_PKCS7(). However since this function is related to writing data we do not consider it security significant.

The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue.

Weakness: CWE-476

Which versions are affected by CVE-2024-0727?

3 open source packages ship an affected version, including cryptography. It affects 1 product.

Products include Openssl Openssl.

How do I fix CVE-2024-0727?

Upgrade cryptography to 42.0.2 or later.

Is CVE-2024-0727 being exploited?

There is no known exploitation of CVE-2024-0727 in the wild and no public exploit code.

Other vulnerabilities in Openssl Openssl

• CVE-2009-3245 Null dereference in n/a Critical 10.0
• CVE-2006-3738 Memory corruption in n/a Critical 10.0
• CVE-2026-63073 Untrusted Sender DN Used as Format String in CMP Response Validation Critical 9.8
• CVE-2016-6309 Use after free in n/a Critical 9.8
• CVE-2016-0799 Integer overflow in n/a Critical 9.8

All Openssl Openssl vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2024-0727, AZL-33935, AZL-33937, AZL-35049, AZL-35086, AZL-37767 and 31 more.