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

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

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer 2022-01-17 10:21:34 +01:00
parent e368b12f6c
commit 226b46770c
2 changed files with 10 additions and 4 deletions
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4
NEWS
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@ -156,7 +156,9 @@ Changes to build and runtime requirements:
Security related changes:
[Add security related changes here]
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:

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)
{
memset ((char *)&sun, 0, sizeof (sun));
sun.sun_family = AF_UNIX;
strcpy (sun.sun_path, hostname);
if (__sockaddr_un_set (&sun, hostname) < 0)
{
struct rpc_createerr *ce = &get_rpc_createerr ();
ce->cf_stat = RPC_SYSTEMERROR;
ce->cf_error.re_errno = errno;
return NULL;
}
sock = RPC_ANYSOCK;
client = clntunix_create (&sun, prog, vers, &sock, 0, 0);
if (client == NULL)