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-rw-r--r--gnu/local.mk1
-rw-r--r--gnu/packages/patches/screen-CVE-2017-5618.patch40
-rw-r--r--gnu/packages/screen.scm2
3 files changed, 43 insertions, 0 deletions
diff --git a/gnu/local.mk b/gnu/local.mk
index 7fc7af6e15..844f2ec8ec 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -891,6 +891,7 @@ dist_patch_DATA = \
%D%/packages/patches/sed-hurd-path-max.patch \
%D%/packages/patches/scheme48-tests.patch \
%D%/packages/patches/scotch-test-threading.patch \
+ %D%/packages/patches/screen-CVE-2017-5618.patch \
%D%/packages/patches/sdl-libx11-1.6.patch \
%D%/packages/patches/seq24-rename-mutex.patch \
%D%/packages/patches/serf-comment-style-fix.patch \
diff --git a/gnu/packages/patches/screen-CVE-2017-5618.patch b/gnu/packages/patches/screen-CVE-2017-5618.patch
new file mode 100644
index 0000000000..1b95e428c8
--- /dev/null
+++ b/gnu/packages/patches/screen-CVE-2017-5618.patch
@@ -0,0 +1,40 @@
+Fixes CVE-2017-5618 (privilege escalation via opening the logfile when
+screen is installed setuid root):
+
+https://savannah.gnu.org/bugs/?50142
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5618
+
+This patch reverts the upstream commit that introduced the bug:
+
+https://git.savannah.gnu.org/cgit/screen.git/commit/?id=5460f5d28c01a9a58e021eb1dffef2965e629d58
+
+From f55b0cc29a0ac2a1c54e8a5e886b7393edd4a76c Mon Sep 17 00:00:00 2001
+From: Leo Famulari <leo@famulari.name>
+Date: Sat, 11 Feb 2017 22:40:24 -0500
+Subject: [PATCH] Revert "adding permissions check for the logfile name"
+
+This reverts commit 5460f5d28c01a9a58e021eb1dffef2965e629d58.
+---
+ src/screen.c | 6 ------
+ 1 file changed, 6 deletions(-)
+
+diff --git a/src/screen.c b/src/screen.c
+index 64650e9..283c305 100644
+--- a/src/screen.c
++++ b/src/screen.c
+@@ -673,12 +673,6 @@ int main(int ac, char** av)
+ Panic(0, "-L: logfile name can not start with \"-\" symbol");
+ if (strlen(screenlogfile) > PATH_MAX)
+ Panic(0, "-L: logfile name too long. (max. %d char)", PATH_MAX);
+-
+- FILE *w_check;
+- if ((w_check = fopen(screenlogfile, "w")) == NULL)
+- Panic(0, "-L: logfile name access problem");
+- else
+- fclose(w_check);
+ }
+ nwin_options.Lflag = 1;
+ break;
+--
+2.11.1
+
diff --git a/gnu/packages/screen.scm b/gnu/packages/screen.scm
index 4f8109abbe..57e6cb595e 100644
--- a/gnu/packages/screen.scm
+++ b/gnu/packages/screen.scm
@@ -40,6 +40,8 @@
(method url-fetch)
(uri (string-append "mirror://gnu/screen/screen-"
version ".tar.gz"))
+ (patches (search-patches "screen-CVE-2017-5618.patch"))
+ (patch-flags '("-p2"))
(sha256
(base32 "1c7grw03a9iwvqbxfd6hmjb681rp8gb55zsxm7b3apqqcb1sghq1"))))
(build-system gnu-build-system)