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CVE-2022-23219: Buffer overflow in sunrpc clnt_create for "unix" (bug 22542) 

Processing an overlong pathname in the sunrpc clnt_create function
results in a stack-based buffer overflow.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit 226b46770c)
This commit is contained in:
Florian Weimer 2022-01-17 10:21:34 +01:00 committed by Aurelien Jarno
parent f10e992e8d
commit 4653cd9e36
2 changed files with 12 additions and 3 deletions
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5
NEWS
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@ -19,10 +19,15 @@ Security related changes:
issue when using a notification type of SIGEV_THREAD and a thread issue when using a notification type of SIGEV_THREAD and a thread
attribute with a non-default affinity mask. attribute with a non-default affinity mask.
CVE-2022-23219: Passing an overlong file name to the clnt_create
legacy function could result in a stack-based buffer overflow when
using the "unix" protocol. Reported by Martin Sebor.
The following bugs are resolved with this release: The following bugs are resolved with this release:
[15271] dlfcn function failure after dlmopen terminates process [15271] dlfcn function failure after dlmopen terminates process
[18435] pthread_once hangs when init routine throws an exception [18435] pthread_once hangs when init routine throws an exception
[22542] CVE-2022-23219: Buffer overflow in sunrpc clnt_create for "unix"
[23462] Static binary with dynamic string tokens ($LIB, $PLATFORM, $ORIGIN) [23462] Static binary with dynamic string tokens ($LIB, $PLATFORM, $ORIGIN)
crashes crashes
[27304] pthread_cond_destroy does not pass private flag to futex system calls [27304] pthread_cond_destroy does not pass private flag to futex system calls

10
sunrpc/clnt_gen.c
View File

@ -57,9 +57,13 @@ clnt_create (const char *hostname, u_long prog, u_long vers,
if (strcmp (proto, "unix") == 0) if (strcmp (proto, "unix") == 0)
{ {
memset ((char *)&sun, 0, sizeof (sun)); if (__sockaddr_un_set (&sun, hostname) < 0)
sun.sun_family = AF_UNIX; {
strcpy (sun.sun_path, hostname); struct rpc_createerr *ce = &get_rpc_createerr ();
ce->cf_stat = RPC_SYSTEMERROR;
ce->cf_error.re_errno = errno;
return NULL;
}
sock = RPC_ANYSOCK; sock = RPC_ANYSOCK;
client = clntunix_create (&sun, prog, vers, &sock, 0, 0); client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
if (client == NULL) if (client == NULL)