From: Helmut Grohne Subject: [PATCH v3] CVE-2022-45142: gsskrb5: fix accidental logic inversions The referenced commit attempted to fix miscompilations with gcc-9 and gcc-10 by changing `memcmp(...)` to `memcmp(...) != 0`. Unfortunately, it also inverted the result of the comparison in two occasions. This inversion happened during backporting the patch to 7.7.1 and 7.8.0. Fixes: f6edaafcfefd ("gsskrb5: CVE-2022-3437 Use constant-time memcmp() for arcfour unwrap") Signed-off-by: Helmut Grohne --- lib/gssapi/krb5/arcfour.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Changes since v1: * Fix typo in commit message. * Mention 7.8.0 in commit message. Thanks to Jeffrey Altman. Changes since v2: * Add CVE identifier. NB (Felix Lechner): The message above and the patch below were taken from the disclosure here: https://www.openwall.com/lists/oss-security/2023/02/08/1 diff --git a/lib/gssapi/krb5/arcfour.c b/lib/gssapi/krb5/arcfour.c index e838d007a..eee6ad72f 100644 --- a/lib/gssapi/krb5/arcfour.c +++ b/lib/gssapi/krb5/arcfour.c @@ -365,7 +365,7 @@ _gssapi_verify_mic_arcfour(OM_uint32 * minor_status, return GSS_S_FAILURE; } - cmp = (ct_memcmp(cksum_data, p + 8, 8) == 0); + cmp = (ct_memcmp(cksum_data, p + 8, 8) != 0); if (cmp) { *minor_status = 0; return GSS_S_BAD_MIC; @@ -730,7 +730,7 @@ OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status, return GSS_S_FAILURE; } - cmp = (ct_memcmp(cksum_data, p0 + 16, 8) == 0); /* SGN_CKSUM */ + cmp = (ct_memcmp(cksum_data, p0 + 16, 8) != 0); /* SGN_CKSUM */ if (cmp) { _gsskrb5_release_buffer(minor_status, output_message_buffer); *minor_status = 0; -- 2.38.1 ef83ce92a8aed7988397436ed5'/>
path: root/gnu/services/authentication.scm
AgeCommit message (Expand)Author
2021-03-10services: Prevent following symlinks during activation....This addresses a potential security issue, where a compromised service could trick the activation code in changing the permissions, owner and group of arbitrary files. However, this patch is currently only a partial fix, due to a TOCTTOU (time-of-check to time-of-use) race, which can be fixed once guile has bindings to openat and friends. Fixes: <https://lists.gnu.org/archive/html/guix-devel/2021-01/msg00388.html> * gnu/build/activation.scm: new procedure 'mkdir-p/perms'. * gnu/services/authentication.scm (%nslcd-activation, nslcd-service-type): use new procedure. * gnu/services/cups.scm (%cups-activation): likewise. * gnu/services/dbus.scm (dbus-activation): likewise. * gnu/services/dns.scm (knot-activation): likewise. Signed-off-by: Ludovic Courtès <ludo@gnu.org> Maxime Devos