rpms/openssh
7
0
Fork 2
Code Issues Pull Requests Releases Activity

Fix CVE-2026-55653

Browse Source 
Fix double free in openssh DH-GEX client path
during FIPS known-group validation that leads
to client-side denial of service

Resolves: RHEL-186440

Signed-off-by: Zoltan Fridrich <zfridric@redhat.com>
This commit is contained in:
Zoltan Fridrich 2026-06-26 14:31:49 +02:00
parent f25c2f5743
commit 70023ff608
2 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
openssh-7.7p1-fips.patch
View File

@ -106,17 +106,18 @@ diff -up openssh-8.6p1/kexgexc.c.fips openssh-8.6p1/kexgexc.c
#include <sys/types.h>
#include <openssl/dh.h>
@@ -115,6 +116,10 @@ input_kex_dh_gex_group(int type, u_int32
r = SSH_ERR_ALLOC_FAIL;
goto out;
@@ -117,6 +118,11 @@ input_kex_dh_gex_group(int type, u_int32
}
p = g = NULL; /* belong to kex->dh now */
+ if (FIPS_mode() && dh_is_known_group(kex->dh) == 0) {
+ r = SSH_ERR_INVALID_ARGUMENT;
+ goto out;
+ }
p = g = NULL; /* belong to kex->dh now */
+
/* generate and send 'e', client DH public key */
if ((r = dh_gen_key(kex->dh, kex->we_need * 8)) != 0)
goto out;
diff -up openssh-8.6p1/myproposal.h.fips openssh-8.6p1/myproposal.h
--- openssh-8.6p1/myproposal.h.fips 2021-04-16 05:55:25.000000000 +0200
+++ openssh-8.6p1/myproposal.h 2021-05-06 12:08:36.498926877 +0200

7
openssh.spec
View File

@ -47,7 +47,7 @@
# Do not forget to bump pam_ssh_agent_auth release if you rewind the main package release to 1
%global openssh_ver 9.9p1
%global openssh_rel 8
%global openssh_rel 9
%global pam_ssh_agent_ver 0.10.4
%global pam_ssh_agent_rel 9
@ -772,6 +772,11 @@ test -f %{sysconfig_anaconda} && \
%endif
%changelog
* Fri Jun 26 2026 Zoltan Fridrich <zfridric@redhat.com> - 9.9p1-9
- CVE-2026-55653: Fix double free in openssh DH-GEX client path during
FIPS known-group validation that leads to client-side denial of service
Resolves: RHEL-186440
* Wed Apr 01 2026 Zoltan Fridrich <zfridric@redhat.com> - 9.9p1-8
- Fix static analysis issues
Resolves: RHEL-163366