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CVE-2015-1781: resolv/nss_dns/dns-host.c buffer overflow [BZ#18287]

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Arjun Shankar 2015-04-21 14:06:31 +02:00 committed by Florian Weimer
parent 7bf8fb1042
commit 2959eda927
3 changed files with 16 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2015-04-21 Arjun Shankar <arjun.is@lostca.se>
[BZ #18287]
* resolv/nss_dns/dns-host.c (getanswer_r): Adjust buffer length
based on padding. (CVE-2015-1781)
2015-04-20 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* nptl/pthread_cond_timedwait.c: Change include bits/libc-vdso.h to just

9
NEWS
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@ -16,7 +16,14 @@ Version 2.22
17969, 17978, 17987, 17991, 17996, 17998, 17999, 18019, 18020, 18029,
18030, 18032, 18036, 18038, 18039, 18042, 18043, 18046, 18047, 18068,
18080, 18093, 18100, 18104, 18110, 18111, 18128, 18138, 18185, 18197,
18206, 18210, 18211, 18247.
18206, 18210, 18211, 18247, 18287.
* A buffer overflow in gethostbyname_r and related functions performing DNS
requests has been fixed. If the NSS functions were called with a
misaligned buffer, the buffer length change due to pointer alignment was
not taken into account. This could result in application crashes or,
potentially arbitrary code execution, using crafted, but syntactically
valid DNS responses. (CVE-2015-1781)
* A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
for LD and GD on x86 and x86-64, has been implemented. You will need

3
resolv/nss_dns/dns-host.c
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@ -615,7 +615,8 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
int have_to_map = 0;
uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data);
buffer += pad;
if (__glibc_unlikely (buflen < sizeof (struct host_data) + pad))
buflen = buflen > pad ? buflen - pad : 0;
if (__glibc_unlikely (buflen < sizeof (struct host_data)))
{
/* The buffer is too small. */
too_small: