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Siddhesh Poyarekar a9728f798e getaddrinfo: Fix use after free in getcanonname (CVE-2023-4806)
When an NSS plugin only implements the _gethostbyname2_r and
_getcanonname_r callbacks, getaddrinfo could use memory that was freed
during tmpbuf resizing, through h_name in a previous query response.

The backing store for res->at->name when doing a query with
gethostbyname3_r or gethostbyname2_r is tmpbuf, which is reallocated in
gethosts during the query.  For AF_INET6 lookup with AI_ALL |
AI_V4MAPPED, gethosts gets called twice, once for a v6 lookup and second
for a v4 lookup.  In this case, if the first call reallocates tmpbuf
enough number of times, resulting in a malloc, th->h_name (that
res->at->name refers to) ends up on a heap allocated storage in tmpbuf.
Now if the second call to gethosts also causes the plugin callback to
return NSS_STATUS_TRYAGAIN, tmpbuf will get freed, resulting in a UAF
reference in res->at->name.  This then gets dereferenced in the
getcanonname_r plugin call, resulting in the use after free.

Fix this by copying h_name over and freeing it at the end.  This
resolves BZ , which is assigned CVE-2023-4806.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit 973fe93a56)
2023-09-15 18:24:58 -04:00
argp argp: Remove old includes in !_LIBC case 2022-07-04 15:25:18 +02:00
assert
benchtests benchtests: Add arc4random benchtest 2022-07-22 11:58:27 -03:00
bits socket: Check lengths before advancing pointer in CMSG_NXTHDR 2022-08-22 16:32:13 +02:00
catgets
ChangeLog.old Create ChangeLog.old/ChangeLog.25. 2022-07-29 18:03:09 -04:00
conform
crypt
csu elf: Fix GL(dl_phdr) and GL(dl_phnum) for static builds [BZ ] 2023-02-03 10:58:23 -03:00
ctype
debug
dirent
dlfcn dlfcn: Pass caller pointer to static dlopen implementation (bug 29446) 2022-08-04 17:57:11 +02:00
elf elf: Remove unused l_text_end field from struct link_map 2023-09-11 09:36:04 +02:00
gmon gmon: Revert addition of tunables to preserve GLIBC_PRIVATE ABI 2023-04-28 17:12:17 +02:00
gnulib
grp
gshadow gshadow: Matching sgetsgent, sgetsgent_r ERANGE handling (bug 30151) 2023-04-24 14:35:54 +02:00
hesiod
htl
hurd
iconv gconv: Use 64-bit interfaces in gconv_parseconfdir (bug 29583) 2022-09-21 12:12:52 +02:00
iconvdata gconv: Correct Big5-HKSCS conversion to preserve all state bits. [BZ ] 2022-07-06 09:27:13 -03:00
include elf: Move l_init_called_next to old place of l_text_end in link map 2023-09-11 09:36:04 +02:00
inet
intl
io io: Fix record locking contants for powerpc64 with __USE_FILE_OFFSET64 2023-09-15 21:31:05 +02:00
libio Apply asm redirections in stdio.h before first use [BZ ] 2022-07-14 16:01:14 -03:00
locale locale: prevent maybe-uninitialized errors with -Os [BZ ] 2022-12-28 17:33:45 -03:00
localedata de_DE: Convert to UTF-8 2022-07-05 09:07:02 +02:00
login
mach
malloc stdlib: Add arc4random, arc4random_buf, and arc4random_uniform (BZ ) 2022-07-22 11:58:27 -03:00
manual gmon: Revert addition of tunables to the manual 2023-04-28 18:13:19 +02:00
math
mathvec
misc cdefs: Limit definition of fortification macros 2023-02-02 09:29:33 -05:00
nis nis: Build libnsl with 64 bit time_t 2022-12-28 15:48:08 -03:00
nptl stdlib: Add arc4random, arc4random_buf, and arc4random_uniform (BZ ) 2022-07-22 11:58:27 -03:00
nptl_db
nscd nscd: Use 64 bit time_t on libc nscd routines (BZ# 29402) 2022-12-28 17:26:22 -03:00
nss getaddrinfo: Fix use after free in getcanonname (CVE-2023-4806) 2023-09-15 18:24:58 -04:00
po Update libc.pot for 2.36 release. 2022-07-29 16:41:57 -04:00
posix Replace __libc_multiple_threads with __libc_single_threaded 2022-07-05 10:14:47 -03:00
pwd
resolv CVE-2023-4527: Stack read overflow with large TCP responses in no-aaaa mode 2023-09-13 14:37:57 +02:00
resource
rt Refactor internal-signals.h 2022-06-30 14:56:21 -03:00
scripts scripts/dso-ordering-test.py: Generate program run-time dependencies 2022-09-20 11:04:44 +02:00
setjmp
shadow
signal Refactor internal-signals.h 2022-06-30 14:56:21 -03:00
socket socket: Check lengths before advancing pointer in CMSG_NXTHDR 2022-08-22 16:32:13 +02:00
soft-fp
stdio-common
stdlib posix: Fix system blocks SIGCHLD erroneously [BZ ] 2023-04-28 16:16:40 +02:00
string x86: Fix wcsnlen-avx2 page cross length comparison [BZ ] 2022-11-24 10:40:09 -08:00
sunrpc sunrpc: Suppress GCC -Os warning on user2netname 2022-12-28 17:37:42 -03:00
support posix: Fix system blocks SIGCHLD erroneously [BZ ] 2023-04-28 16:16:40 +02:00
sysdeps getaddrinfo: Fix use after free in getcanonname (CVE-2023-4806) 2023-09-15 18:24:58 -04:00
sysvipc
termios
time Use 64-bit time_t interfaces in strftime and strptime (bug 30053) 2023-02-07 10:37:30 -03:00
timezone time: Set daylight to 1 for matching DST/offset change (bug 29951) 2023-01-10 16:27:23 +01:00
wcsmbs Apply asm redirections in wchar.h before first use 2022-08-31 09:03:41 +02:00
wctype
.clang-format
.gitattributes
.gitignore
abi-tags
aclocal.m4
config.h.in LoongArch: Add LoongArch entries to config.h.in 2022-07-26 12:35:12 -03:00
config.make.in
configure
configure.ac
CONTRIBUTED-BY
COPYING
COPYING.LIB
extra-lib.mk
gen-locales.mk
INSTALL Update install.texi, and regenerate INSTALL. 2022-07-29 17:51:16 -04:00
libc-abis
libof-iterator.mk
LICENSES arc4random: simplify design for better safety 2022-07-27 08:58:27 -03:00
MAINTAINERS Add MAINTAINERS 2017-05-11 13:38:30 -04:00
Makeconfig nis: Build libnsl with 64 bit time_t 2022-12-28 15:48:08 -03:00
Makefile
Makefile.help
Makefile.in
Makerules Makerules: fix MAKEFLAGS assignment for upcoming make-4.4 [BZ# 29564] 2022-11-08 22:46:32 -05:00
NEWS io: Fix record locking contants for powerpc64 with __USE_FILE_OFFSET64 2023-09-15 21:31:05 +02:00
o-iterator.mk
README LoongArch: Update NEWS and README for the LoongArch port. 2022-07-26 12:35:12 -03:00
Rules
SHARED-FILES
shlib-versions
test-skeleton.c
version.h Prepare for glibc 2.36 release. 2022-07-29 17:59:01 -04:00

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