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gnu: glibc: Fix CVE-2023-4911.

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* gnu/packages/patches/glibc-2.35-CVE-2023-4911.patch: New file.
* gnu/local.mk: Register it here.
* gnu/packages/base.scm (glibc/fixed): New variable.
(glibc): Use it as replacement.
This commit is contained in:
Liliana Marie Prikler 2023-10-04 21:27:13 +02:00
parent f62737bfee
commit 1328c4cca5
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GPG Key ID: 442A84B8C70E2F87
3 changed files with 171 additions and 0 deletions
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1
gnu/local.mk
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@ -1284,6 +1284,7 @@ dist_patch_DATA = \
%D%/packages/patches/glibc-CVE-2019-7309.patch \
%D%/packages/patches/glibc-CVE-2019-9169.patch \
%D%/packages/patches/glibc-CVE-2019-19126.patch \
%D%/packages/patches/glibc-2.35-CVE-2023-4911.patch \
%D%/packages/patches/glibc-allow-kernel-2.6.32.patch \
%D%/packages/patches/glibc-boot-2.16.0.patch \
%D%/packages/patches/glibc-boot-2.2.5.patch \

10
gnu/packages/base.scm
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@ -793,6 +793,7 @@ the store.")
(package
(name "glibc")
(version "2.35")
(replacement glibc/fixed)
(source (origin
(method url-fetch)
(uri (string-append "mirror://gnu/glibc/glibc-" version ".tar.xz"))
@ -1062,6 +1063,15 @@ with the Linux kernel.")
(license lgpl2.0+)
(home-page "https://www.gnu.org/software/libc/")))
(define glibc/fixed
(package
(inherit glibc)
(source
(origin (inherit (package-source glibc))
(patches
(append (search-patches "glibc-2.35-CVE-2023-4911.patch")
(origin-patches (package-source glibc))))))))
;; Define a variation of glibc which uses the default /etc/ld.so.cache, useful
;; in FHS containers.
(define-public glibc-for-fhs

160
gnu/packages/patches/glibc-2.35-CVE-2023-4911.patch Normal file
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@ -0,0 +1,160 @@
From 1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa Mon Sep 17 00:00:00 2001
From: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date: Tue, 19 Sep 2023 18:39:32 -0400
Subject: [PATCH 1/1] tunables: Terminate if end of input is reached
(CVE-2023-4911)
The string parsing routine may end up writing beyond bounds of tunestr
if the input tunable string is malformed, of the form name=name=val.
This gets processed twice, first as name=name=val and next as name=val,
resulting in tunestr being name=name=val:name=val, thus overflowing
tunestr.
Terminate the parsing loop at the first instance itself so that tunestr
does not overflow.
This also fixes up tst-env-setuid-tunables to actually handle failures
correct and add new tests to validate the fix for this CVE.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
---
Backported to 2.35 by Liliana Marie Prikler <liliana.prikler@gmail.com>
NEWS | 5 +++++
elf/dl-tunables.c | 17 +++++++++-------
elf/tst-env-setuid-tunables.c | 37 +++++++++++++++++++++++++++--------
3 files changed, 44 insertions(+), 15 deletions(-)
Index: glibc-2.35/NEWS
===================================================================
--- glibc-2.35.orig/NEWS
+++ glibc-2.35/NEWS
@@ -199,6 +199,11 @@ Security related changes:
corresponds to the / directory through an unprivileged mount
namespace. Reported by Qualys.
+ CVE-2023-4911: If a tunable of the form NAME=NAME=VAL is passed in the
+ environment of a setuid program and NAME is valid, it may result in a
+ buffer overflow, which could be exploited to achieve escalated
+ privileges. This flaw was introduced in glibc 2.34.
+
The following bugs are resolved with this release:
[12889] nptl: Race condition in pthread_kill
Index: glibc-2.35/elf/dl-tunables.c
===================================================================
--- glibc-2.35.orig/elf/dl-tunables.c
+++ glibc-2.35/elf/dl-tunables.c
@@ -187,11 +187,7 @@ parse_tunables (char *tunestr, char *val
/* If we reach the end of the string before getting a valid name-value
pair, bail out. */
if (p[len] == '\0')
- {
- if (__libc_enable_secure)
- tunestr[off] = '\0';
- return;
- }
+ break;
/* We did not find a valid name-value pair before encountering the
colon. */
@@ -251,9 +247,16 @@ parse_tunables (char *tunestr, char *val
}
}
- if (p[len] != '\0')
- p += len + 1;
+ /* We reached the end while processing the tunable string. */
+ if (p[len] == '\0')
+ break;
+
+ p += len + 1;
}
+
+ /* Terminate tunestr before we leave. */
+ if (__libc_enable_secure)
+ tunestr[off] = '\0';
}
#endif
Index: glibc-2.35/elf/tst-env-setuid-tunables.c
===================================================================
--- glibc-2.35.orig/elf/tst-env-setuid-tunables.c
+++ glibc-2.35/elf/tst-env-setuid-tunables.c
@@ -52,6 +52,8 @@ const char *teststrings[] =
"glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
"glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096",
"not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
+ "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096",
+ "glibc.malloc.check=2",
"glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2",
"glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096",
":glibc.malloc.garbage=2:glibc.malloc.check=1",
@@ -70,6 +72,8 @@ const char *resultstrings[] =
"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
"glibc.malloc.mmap_threshold=4096",
+ "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096",
+ "",
"",
"",
"",
@@ -89,6 +93,8 @@ test_child (int off)
if (val != NULL)
printf ("[%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
+ else
+ printf ("[%d] GLIBC_TUNABLES environment variable absent\n", off);
return 1;
#else
@@ -117,21 +123,26 @@ do_test (int argc, char **argv)
if (ret != 0)
exit (1);
- exit (EXIT_SUCCESS);
+ /* Special return code to make sure that the child executed all the way
+ through. */
+ exit (42);
}
else
{
- int ret = 0;
-
/* Spawn tests. */
for (int i = 0; i < array_length (teststrings); i++)
{
char buf[INT_BUFSIZE_BOUND (int)];
- printf ("Spawned test for %s (%d)\n", teststrings[i], i);
+ printf ("[%d] Spawned test for %s\n", i, teststrings[i]);
snprintf (buf, sizeof (buf), "%d\n", i);
+ fflush (stdout);
if (setenv ("GLIBC_TUNABLES", teststrings[i], 1) != 0)
- exit (1);
+ {
+ printf (" [%d] Failed to set GLIBC_TUNABLES: %m", i);
+ support_record_failure ();
+ continue;
+ }
int status = support_capture_subprogram_self_sgid (buf);
@@ -139,9 +150,14 @@ do_test (int argc, char **argv)
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
- ret |= status;
+ if (WEXITSTATUS (status) != 42)
+ {
+ printf (" [%d] child failed with status %d\n", i,
+ WEXITSTATUS (status));
+ support_record_failure ();
+ }
}
- return ret;
+ return 0;
}
}