* [PATCH 0/1] Cracklib security CVE-2016-6318 @ 2016-08-17 2:49 Leo Famulari 2016-08-17 2:49 ` [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318 Leo Famulari 0 siblings, 1 reply; 5+ messages in thread From: Leo Famulari @ 2016-08-17 2:49 UTC (permalink / raw) To: guix-devel A stack overflow in Cracklib that could potentially lead to arbitrary code execution was just disclosed: http://seclists.org/oss-sec/2016/q3/290 "When an application compiled against the cracklib libary, such as "passwd" is used to parse the GECOS field, it could cause the application to crash or execute arbitary code with the permissions of the user running such an application." The message recommends this patch: https://bugzilla.redhat.com/show_bug.cgi?id=1364944#c2 For us, cracklib is used by libpwquality, which is used in turn by gnome-control-center. Passwd is safe: $ guix build --check shadow [...] shadow will be compiled with the following features: auditing support: no CrackLib support: no PAM support: yes suid account management tools: yes SELinux support: no ACL support: no Extended Attributes support: no tcb support (incomplete): no shadow group support: yes S/Key support: no SHA passwords encryption: yes nscd support: yes subordinate IDs support: yes Leo Famulari (1): gnu: cracklib: Fix CVE-2016-6318. gnu/local.mk | 1 + gnu/packages/password-utils.scm | 2 + gnu/packages/patches/cracklib-CVE-2016-6318.patch | 95 +++++++++++++++++++++++ 3 files changed, 98 insertions(+) create mode 100644 gnu/packages/patches/cracklib-CVE-2016-6318.patch -- 2.9.3 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318. 2016-08-17 2:49 [PATCH 0/1] Cracklib security CVE-2016-6318 Leo Famulari @ 2016-08-17 2:49 ` Leo Famulari 2016-08-17 4:29 ` Eric Bavier 0 siblings, 1 reply; 5+ messages in thread From: Leo Famulari @ 2016-08-17 2:49 UTC (permalink / raw) To: guix-devel * gnu/packages/patches/cracklib-CVE-2016-6318.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. * gnu/packages/password-utils.scm (cracklib)[source]: Use the patch. --- gnu/local.mk | 1 + gnu/packages/password-utils.scm | 2 + gnu/packages/patches/cracklib-CVE-2016-6318.patch | 95 +++++++++++++++++++++++ 3 files changed, 98 insertions(+) create mode 100644 gnu/packages/patches/cracklib-CVE-2016-6318.patch diff --git a/gnu/local.mk b/gnu/local.mk index 7416850..d890046 100644 --- a/gnu/local.mk +++ b/gnu/local.mk @@ -464,6 +464,7 @@ dist_patch_DATA = \ %D%/packages/patches/cpio-gets-undeclared.patch \ %D%/packages/patches/cpio-CVE-2016-2037.patch \ %D%/packages/patches/cpufrequtils-fix-aclocal.patch \ + %D%/packages/patches/cracklib-CVE-2016-6318.patch \ %D%/packages/patches/crda-optional-gcrypt.patch \ %D%/packages/patches/crossmap-allow-system-pysam.patch \ %D%/packages/patches/csound-header-ordering.patch \ diff --git a/gnu/packages/password-utils.scm b/gnu/packages/password-utils.scm index 7a8bdcb..7288da6 100644 --- a/gnu/packages/password-utils.scm +++ b/gnu/packages/password-utils.scm @@ -29,6 +29,7 @@ #:use-module (guix build-system gnu) #:use-module (guix download) #:use-module (guix packages) + #:use-module (gnu packages) #:use-module (gnu packages admin) #:use-module (gnu packages base) #:use-module (gnu packages compression) @@ -159,6 +160,7 @@ and vice versa.") (uri (string-append "https://github.com/cracklib/cracklib/" "releases/download/" name "-" version "/" name "-" version ".tar.gz")) + (patches (search-patches "cracklib-CVE-2016-6318.patch")) (sha256 (base32 "0hrkb0prf7n92w6rxgq0ilzkk6rkhpys2cfqkrbzswp27na7dkqp")))) diff --git a/gnu/packages/patches/cracklib-CVE-2016-6318.patch b/gnu/packages/patches/cracklib-CVE-2016-6318.patch new file mode 100644 index 0000000..4806eca --- /dev/null +++ b/gnu/packages/patches/cracklib-CVE-2016-6318.patch @@ -0,0 +1,95 @@ +Fix CVE-2016-6318. + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6318 + +Patch copied from Red Hat: + +https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-6318 +https://bugzilla.redhat.com/attachment.cgi?id=1188599&action=diff + +It is not safe to pass words longer than STRINGSIZE further to cracklib +so the longbuffer cannot be longer than STRINGSIZE. +diff -up cracklib-2.9.0/lib/fascist.c.longgecos cracklib-2.9.0/lib/fascist.c +--- cracklib-2.9.0/lib/fascist.c.longgecos 2014-02-06 16:03:59.000000000 +0100 ++++ cracklib-2.9.0/lib/fascist.c 2016-08-08 12:05:40.279235815 +0200 +@@ -515,7 +515,7 @@ FascistGecosUser(char *password, const c + char gbuffer[STRINGSIZE]; + char tbuffer[STRINGSIZE]; + char *uwords[STRINGSIZE]; +- char longbuffer[STRINGSIZE * 2]; ++ char longbuffer[STRINGSIZE]; + + if (gecos == NULL) + gecos = ""; +@@ -596,38 +596,47 @@ FascistGecosUser(char *password, const c + { + for (i = 0; i < j; i++) + { +- strcpy(longbuffer, uwords[i]); +- strcat(longbuffer, uwords[j]); +- +- if (GTry(longbuffer, password)) ++ if (strlen(uwords[i]) + strlen(uwords[j]) < STRINGSIZE) + { +- return _("it is derived from your password entry"); +- } +- +- strcpy(longbuffer, uwords[j]); +- strcat(longbuffer, uwords[i]); ++ strcpy(longbuffer, uwords[i]); ++ strcat(longbuffer, uwords[j]); + +- if (GTry(longbuffer, password)) +- { +- return _("it's derived from your password entry"); ++ if (GTry(longbuffer, password)) ++ { ++ return _("it is derived from your password entry"); ++ } ++ ++ strcpy(longbuffer, uwords[j]); ++ strcat(longbuffer, uwords[i]); ++ ++ if (GTry(longbuffer, password)) ++ { ++ return _("it's derived from your password entry"); ++ } + } + +- longbuffer[0] = uwords[i][0]; +- longbuffer[1] = '\0'; +- strcat(longbuffer, uwords[j]); +- +- if (GTry(longbuffer, password)) ++ if (strlen(uwords[j]) < STRINGSIZE - 1) + { +- return _("it is derivable from your password entry"); ++ longbuffer[0] = uwords[i][0]; ++ longbuffer[1] = '\0'; ++ strcat(longbuffer, uwords[j]); ++ ++ if (GTry(longbuffer, password)) ++ { ++ return _("it is derivable from your password entry"); ++ } + } + +- longbuffer[0] = uwords[j][0]; +- longbuffer[1] = '\0'; +- strcat(longbuffer, uwords[i]); +- +- if (GTry(longbuffer, password)) ++ if (strlen(uwords[i]) < STRINGSIZE - 1) + { +- return _("it's derivable from your password entry"); ++ longbuffer[0] = uwords[j][0]; ++ longbuffer[1] = '\0'; ++ strcat(longbuffer, uwords[i]); ++ ++ if (GTry(longbuffer, password)) ++ { ++ return _("it's derivable from your password entry"); ++ } + } + } + } -- 2.9.3 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318. 2016-08-17 2:49 ` [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318 Leo Famulari @ 2016-08-17 4:29 ` Eric Bavier 2016-08-17 4:44 ` Leo Famulari 0 siblings, 1 reply; 5+ messages in thread From: Eric Bavier @ 2016-08-17 4:29 UTC (permalink / raw) To: Leo Famulari; +Cc: guix-devel On Tue, 16 Aug 2016 22:49:55 -0400 Leo Famulari <leo@famulari.name> wrote: > * gnu/packages/patches/cracklib-CVE-2016-6318.patch: New file. > * gnu/local.mk (dist_patch_DATA): Add it. > * gnu/packages/password-utils.scm (cracklib)[source]: Use the patch. > --- > gnu/local.mk | 1 + > gnu/packages/password-utils.scm | 2 + > gnu/packages/patches/cracklib-CVE-2016-6318.patch | 95 +++++++++++++++++++++++ > 3 files changed, 98 insertions(+) > create mode 100644 gnu/packages/patches/cracklib-CVE-2016-6318.patch LGTM! Thanks for getting the patch so quick. From the bug report it looks like we could get some real benefit from the hardening project thread you revived. `~Eric ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318. 2016-08-17 4:29 ` Eric Bavier @ 2016-08-17 4:44 ` Leo Famulari 2016-08-23 21:06 ` Leo Famulari 0 siblings, 1 reply; 5+ messages in thread From: Leo Famulari @ 2016-08-17 4:44 UTC (permalink / raw) To: Eric Bavier; +Cc: guix-devel On Tue, Aug 16, 2016 at 11:29:11PM -0500, Eric Bavier wrote: > On Tue, 16 Aug 2016 22:49:55 -0400 > Leo Famulari <leo@famulari.name> wrote: > > > * gnu/packages/patches/cracklib-CVE-2016-6318.patch: New file. > > * gnu/local.mk (dist_patch_DATA): Add it. > > * gnu/packages/password-utils.scm (cracklib)[source]: Use the patch. > > --- > > gnu/local.mk | 1 + > > gnu/packages/password-utils.scm | 2 + > > gnu/packages/patches/cracklib-CVE-2016-6318.patch | 95 +++++++++++++++++++++++ > > 3 files changed, 98 insertions(+) > > create mode 100644 gnu/packages/patches/cracklib-CVE-2016-6318.patch > > LGTM! Thanks for getting the patch so quick. Thanks for the fast review! Pushed as 53dcbbec07c > From the bug report it looks like we could get some real benefit from > the hardening project thread you revived. Yes, it does look like that! ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318. 2016-08-17 4:44 ` Leo Famulari @ 2016-08-23 21:06 ` Leo Famulari 0 siblings, 0 replies; 5+ messages in thread From: Leo Famulari @ 2016-08-23 21:06 UTC (permalink / raw) To: Eric Bavier; +Cc: guix-devel On Wed, Aug 17, 2016 at 12:44:29AM -0400, Leo Famulari wrote: > On Tue, Aug 16, 2016 at 11:29:11PM -0500, Eric Bavier wrote: > > On Tue, 16 Aug 2016 22:49:55 -0400 > > Leo Famulari <leo@famulari.name> wrote: > > > > > * gnu/packages/patches/cracklib-CVE-2016-6318.patch: New file. > > > * gnu/local.mk (dist_patch_DATA): Add it. > > > * gnu/packages/password-utils.scm (cracklib)[source]: Use the patch. > > > --- > > > gnu/local.mk | 1 + > > > gnu/packages/password-utils.scm | 2 + > > > gnu/packages/patches/cracklib-CVE-2016-6318.patch | 95 +++++++++++++++++++++++ > > > 3 files changed, 98 insertions(+) > > > create mode 100644 gnu/packages/patches/cracklib-CVE-2016-6318.patch > > > > LGTM! Thanks for getting the patch so quick. > > Thanks for the fast review! Pushed as 53dcbbec07c It seems this story is not over. SuSE identified another buffer overflow: http://seclists.org/oss-sec/2016/q3/370 What do people think of the patch linked from that message? ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-08-23 21:06 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2016-08-17 2:49 [PATCH 0/1] Cracklib security CVE-2016-6318 Leo Famulari 2016-08-17 2:49 ` [PATCH 1/1] gnu: cracklib: Fix CVE-2016-6318 Leo Famulari 2016-08-17 4:29 ` Eric Bavier 2016-08-17 4:44 ` Leo Famulari 2016-08-23 21:06 ` Leo Famulari
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