| Name | CVE-2022-4450 |
| 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.
|
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3325-1, DSA-5343-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| openssl (PTS) | jessie, jessie (lts) | 1.0.1t-1+deb8u21 | fixed |
| stretch (security) | 1.1.0l-1~deb9u6 | fixed |
| stretch (lts), stretch | 1.1.0l-1~deb9u9 | fixed |
| buster | 1.1.1n-0+deb10u3 | vulnerable |
| buster (security) | 1.1.1n-0+deb10u6 | fixed |
| bullseye | 1.1.1w-0+deb11u1 | fixed |
| bullseye (security) | 1.1.1n-0+deb11u5 | fixed |
| bookworm (security), bookworm | 3.0.11-1~deb12u2 | fixed |
| sid, trixie | 3.2.1-3 | fixed |
| openssl1.0 (PTS) | stretch (security) | 1.0.2u-1~deb9u7 | fixed |
| stretch (lts), stretch | 1.0.2u-1~deb9u9 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://www.openssl.org/news/secadv/20230207.txt
https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=63bcf189be73a9cc1264059bed6f57974be74a83 (openssl-3.0.8)
https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=bbcf509bd046b34cca19c766bbddc31683d0858b (OpenSSL_1_1_1t)
[stretch] - openssl <not-affected> (Vulnerable code introduced later)
[jessie] - openssl <not-affected> (Vulnerable code introduced later)
- openssl1.0 <not-affected> (Vulnerable code introduced later)