Bug 4287 - [Anolis OS 7] Bugfix for CVE-2022-4450
Summary: [Anolis OS 7] Bugfix for CVE-2022-4450
Status: NEW
Alias: None
Product: Anolis OS 7
Classification: Anolis OS
Component: BaseOS Packages (show other bugs) BaseOS Packages
Version: 7.7
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: 杨晓旋
QA Contact: 杨晓旋
URL:
Whiteboard:
Keywords: CVE
Depends on:
Blocks:
 
Reported: 2023-03-02 14:38 UTC by 小龙
Modified: 2023-03-02 14:38 UTC (History)
1 user (show)

See Also:


Attachments

Note You need to log in before you can comment on or make changes to this bug.
Description 小龙 admin 2023-03-02 14:38:05 UTC
Description:
The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data. If the function succeeds then the "name_out", "header" and "data" arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.

Broken commit info:

Bugfix commit info: