CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2026/04/07 07:15:29
Modified files:
lib/libcrypto/rsa: rsa_ameth.c rsa_pmeth.c
Log message:
Fix NULL deref for malformed OAEP parameters in CMS decryption
This converts rsa_cms_decrypt() to use X509_ALGOR_get0() and fixes a
NULL deref when a parameter is (invalidly) omitted similar to the fix
in ec/ec_ameth.c r1.66 from a couple years back. There is currently
an XXX annotating a hairy leak due to trying to be smart and stealing
the parameters from the oaep object. Instead, just make a copy of the
label string and free it in the exit path.
The diff adds an error for labellen == 0 since that is an invalid
encoding of pSpecifiedEmpty (see RFC 8017) -- per the DER the default
must be omitted. This way we avoid a malloc(0) implementation-defined
behavior.
This minor issue was assigned CVE-2026-28390 by OpenSSL and was reported
by too many to list. The fix is my own. It is similar to OpenSSL's fix
only because I rewiewed theirs and suggested an improvement or two.
This is the last of the "security fixes" in today's OpenSSL release that
"affect" LibreSSL. All the other bugs were already fixed a few years back
or we didn't have the code/bugs in the first place.
ok beck jsing
