gnu: glibc: Fix CVE-2023-4911.
* 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.
Liliana Marie Prikler
parent
f62737bfee
commit
1328c4cca5
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@ -1284,6 +1284,7 @@ dist_patch_DATA = \
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%D%/packages/patches/glibc-CVE-2019-7309.patch \
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%D%/packages/patches/glibc-CVE-2019-9169.patch \
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%D%/packages/patches/glibc-CVE-2019-19126.patch \
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%D%/packages/patches/glibc-2.35-CVE-2023-4911.patch \
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%D%/packages/patches/glibc-allow-kernel-2.6.32.patch \
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%D%/packages/patches/glibc-boot-2.16.0.patch \
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%D%/packages/patches/glibc-boot-2.2.5.patch \
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@ -793,6 +793,7 @@ the store.")
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(package
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(name "glibc")
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(version "2.35")
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(replacement glibc/fixed)
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(source (origin
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(method url-fetch)
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(uri (string-append "mirror://gnu/glibc/glibc-" version ".tar.xz"))
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@ -1062,6 +1063,15 @@ with the Linux kernel.")
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(license lgpl2.0+)
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(home-page "https://www.gnu.org/software/libc/")))
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(define glibc/fixed
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(package
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(inherit glibc)
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(source
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(origin (inherit (package-source glibc))
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(patches
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(append (search-patches "glibc-2.35-CVE-2023-4911.patch")
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(origin-patches (package-source glibc))))))))
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;; Define a variation of glibc which uses the default /etc/ld.so.cache, useful
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;; in FHS containers.
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(define-public glibc-for-fhs
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@ -0,0 +1,160 @@
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From 1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa Mon Sep 17 00:00:00 2001
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From: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Date: Tue, 19 Sep 2023 18:39:32 -0400
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Subject: [PATCH 1/1] tunables: Terminate if end of input is reached
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(CVE-2023-4911)
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The string parsing routine may end up writing beyond bounds of tunestr
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if the input tunable string is malformed, of the form name=name=val.
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This gets processed twice, first as name=name=val and next as name=val,
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resulting in tunestr being name=name=val:name=val, thus overflowing
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tunestr.
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Terminate the parsing loop at the first instance itself so that tunestr
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does not overflow.
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This also fixes up tst-env-setuid-tunables to actually handle failures
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correct and add new tests to validate the fix for this CVE.
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Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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---
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Backported to 2.35 by Liliana Marie Prikler <liliana.prikler@gmail.com>
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NEWS | 5 +++++
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elf/dl-tunables.c | 17 +++++++++-------
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elf/tst-env-setuid-tunables.c | 37 +++++++++++++++++++++++++++--------
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3 files changed, 44 insertions(+), 15 deletions(-)
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Index: glibc-2.35/NEWS
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===================================================================
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--- glibc-2.35.orig/NEWS
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+++ glibc-2.35/NEWS
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@@ -199,6 +199,11 @@ Security related changes:
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corresponds to the / directory through an unprivileged mount
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namespace. Reported by Qualys.
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+ CVE-2023-4911: If a tunable of the form NAME=NAME=VAL is passed in the
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+ environment of a setuid program and NAME is valid, it may result in a
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+ buffer overflow, which could be exploited to achieve escalated
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+ privileges. This flaw was introduced in glibc 2.34.
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+
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The following bugs are resolved with this release:
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[12889] nptl: Race condition in pthread_kill
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Index: glibc-2.35/elf/dl-tunables.c
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===================================================================
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--- glibc-2.35.orig/elf/dl-tunables.c
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+++ glibc-2.35/elf/dl-tunables.c
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@@ -187,11 +187,7 @@ parse_tunables (char *tunestr, char *val
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/* If we reach the end of the string before getting a valid name-value
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pair, bail out. */
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if (p[len] == '\0')
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- {
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- if (__libc_enable_secure)
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- tunestr[off] = '\0';
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- return;
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- }
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+ break;
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/* We did not find a valid name-value pair before encountering the
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colon. */
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@@ -251,9 +247,16 @@ parse_tunables (char *tunestr, char *val
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}
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}
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- if (p[len] != '\0')
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- p += len + 1;
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+ /* We reached the end while processing the tunable string. */
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+ if (p[len] == '\0')
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+ break;
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+
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+ p += len + 1;
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}
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+
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+ /* Terminate tunestr before we leave. */
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+ if (__libc_enable_secure)
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+ tunestr[off] = '\0';
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}
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#endif
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Index: glibc-2.35/elf/tst-env-setuid-tunables.c
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===================================================================
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--- glibc-2.35.orig/elf/tst-env-setuid-tunables.c
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+++ glibc-2.35/elf/tst-env-setuid-tunables.c
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@@ -52,6 +52,8 @@ const char *teststrings[] =
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"glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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"glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096",
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"not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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+ "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096",
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+ "glibc.malloc.check=2",
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"glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2",
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"glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096",
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":glibc.malloc.garbage=2:glibc.malloc.check=1",
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@@ -70,6 +72,8 @@ const char *resultstrings[] =
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"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.mmap_threshold=4096",
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"glibc.malloc.mmap_threshold=4096",
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+ "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096",
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+ "",
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"",
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"",
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"",
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@@ -89,6 +93,8 @@ test_child (int off)
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if (val != NULL)
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printf ("[%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
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+ else
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+ printf ("[%d] GLIBC_TUNABLES environment variable absent\n", off);
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return 1;
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#else
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@@ -117,21 +123,26 @@ do_test (int argc, char **argv)
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if (ret != 0)
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exit (1);
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- exit (EXIT_SUCCESS);
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+ /* Special return code to make sure that the child executed all the way
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+ through. */
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+ exit (42);
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}
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else
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{
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- int ret = 0;
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-
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/* Spawn tests. */
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for (int i = 0; i < array_length (teststrings); i++)
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{
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char buf[INT_BUFSIZE_BOUND (int)];
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- printf ("Spawned test for %s (%d)\n", teststrings[i], i);
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+ printf ("[%d] Spawned test for %s\n", i, teststrings[i]);
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snprintf (buf, sizeof (buf), "%d\n", i);
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+ fflush (stdout);
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if (setenv ("GLIBC_TUNABLES", teststrings[i], 1) != 0)
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- exit (1);
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+ {
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+ printf (" [%d] Failed to set GLIBC_TUNABLES: %m", i);
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+ support_record_failure ();
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+ continue;
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+ }
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int status = support_capture_subprogram_self_sgid (buf);
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@@ -139,9 +150,14 @@ do_test (int argc, char **argv)
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if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
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return EXIT_UNSUPPORTED;
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- ret |= status;
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+ if (WEXITSTATUS (status) != 42)
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+ {
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+ printf (" [%d] child failed with status %d\n", i,
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+ WEXITSTATUS (status));
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+ support_record_failure ();
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+ }
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}
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- return ret;
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+ return 0;
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}
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}
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