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Resolves: #1321954

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CVE-2016-3075: Stack overflow in _nss_dns_getnetbyname_r
This commit is contained in:
Florian Weimer 2016-05-06 16:35:32 +02:00
parent 6702e0c88e
commit 116e17a138
2 changed files with 35 additions and 0 deletions
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32
glibc-rh1321954.patch Normal file
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@ -0,0 +1,32 @@
commit 317b199b4aff8cfa27f2302ab404d2bb5032b9a4
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Mar 29 12:57:56 2016 +0200
CVE-2016-3075: Stack overflow in _nss_dns_getnetbyname_r [BZ #19879]
The defensive copy is not needed because the name may not alias the
output buffer.
diff --git a/resolv/nss_dns/dns-network.c b/resolv/nss_dns/dns-network.c
index 2eb2f67..8f301a7 100644
--- a/resolv/nss_dns/dns-network.c
+++ b/resolv/nss_dns/dns-network.c
@@ -118,17 +118,14 @@ _nss_dns_getnetbyname_r (const char *name, struct netent *result,
} net_buffer;
querybuf *orig_net_buffer;
int anslen;
- char *qbuf;
enum nss_status status;
if (__res_maybe_init (&_res, 0) == -1)
return NSS_STATUS_UNAVAIL;
- qbuf = strdupa (name);
-
net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
- anslen = __libc_res_nsearch (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf,
+ anslen = __libc_res_nsearch (&_res, name, C_IN, T_PTR, net_buffer.buf->buf,
1024, &net_buffer.ptr, NULL, NULL, NULL, NULL);
if (anslen < 0)
{

3
glibc.spec
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@ -225,6 +225,7 @@ Patch1002: glibc-rh1276761-1.patch
Patch1003: glibc-rh1276761-2.patch Patch1003: glibc-rh1276761-2.patch
Patch1004: glibc-rh1276761-3.patch Patch1004: glibc-rh1276761-3.patch
Patch1005: glibc-rh1332912.patch Patch1005: glibc-rh1332912.patch
Patch1006: glibc-rh1321954.patch
############################################################################## ##############################################################################
# #
@ -649,6 +650,7 @@ microbenchmark tests on the system.
%patch1003 -p1 %patch1003 -p1
%patch1004 -p1 %patch1004 -p1
%patch1005 -p1 %patch1005 -p1
%patch1006 -p1
%patch0059 -p1 %patch0059 -p1
############################################################################## ##############################################################################
@ -1871,6 +1873,7 @@ rm -f *.filelist*
%changelog %changelog
* Fri May 6 2016 Florian Weimer <fweimer@redhat.com> - 2.22-12 * Fri May 6 2016 Florian Weimer <fweimer@redhat.com> - 2.22-12
- Fix heap-based buffer overflow in get_txt_records (#1332912) - Fix heap-based buffer overflow in get_txt_records (#1332912)
- CVE-2016-3075: Stack overflow in _nss_dns_getnetbyname_r (#1321954)
* Wed Mar 02 2016 Mike FABIAN <mfabian@redhat.com> - 2.22-11 * Wed Mar 02 2016 Mike FABIAN <mfabian@redhat.com> - 2.22-11
- Add the C.UTF-8 locale - Add the C.UTF-8 locale