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| author | Carlos O'Donell <carlos@systemhalted.org> | 2016-02-16 21:26:37 -0500 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2016-02-16 22:16:35 -0500 |
| commit | b995d95a5943785be3ab862b2d3276f3b4a22481 (patch) | |
| tree | 5a06b3f7b6f8bcb4377aaabaedf9395d5141d18c /NEWS | |
| parent | 4660fb2714c52dba4addab496b3f1ae8e6c633b3 (diff) | |
| download | glibc-b995d95a5943785be3ab862b2d3276f3b4a22481.tar.gz | |
CVE-2015-7547: getaddrinfo() stack-based buffer overflow (Bug 18665).
* A stack-based buffer overflow was found in libresolv when invoked from
libnss_dns, allowing specially crafted DNS responses to seize control
of execution flow in the DNS client. The buffer overflow occurs in
the functions send_dg (send datagram) and send_vc (send TCP) for the
NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
family. The use of AF_UNSPEC triggers the low-level resolver code to
send out two parallel queries for A and AAAA. A mismanagement of the
buffers used for those queries could result in the response of a query
writing beyond the alloca allocated buffer created by
_nss_dns_gethostbyname4_r. Buffer management is simplified to remove
the overflow. Thanks to the Google Security Team and Red Hat for
reporting the security impact of this issue, and Robert Holiday of
Ciena for reporting the related bug 18665. (CVE-2015-7547)
See also:
https://sourceware.org/ml/libc-alpha/2016-02/msg00416.html
https://sourceware.org/ml/libc-alpha/2016-02/msg00418.html
(cherry picked from commit e9db92d3acfe1822d56d11abcea5bfc4c41cf6ca)
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -7,6 +7,20 @@ using `glibc' in the "product" field. Version 2.22.1 +* A stack-based buffer overflow was found in libresolv when invoked from + libnss_dns, allowing specially crafted DNS responses to seize control + of execution flow in the DNS client. The buffer overflow occurs in + the functions send_dg (send datagram) and send_vc (send TCP) for the + NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC + family. The use of AF_UNSPEC triggers the low-level resolver code to + send out two parallel queries for A and AAAA. A mismanagement of the + buffers used for those queries could result in the response of a query + writing beyond the alloca allocated buffer created by + _nss_dns_gethostbyname4_r. Buffer management is simplified to remove + the overflow. Thanks to the Google Security Team and Red Hat for + reporting the security impact of this issue, and Robert Holiday of + Ciena for reporting the related bug 18665. (CVE-2015-7547) + * The following bugs are resolved with this release: 17905, 18420, 18421, 18480, 18589, 18743, 18778, 18781, 18787, 18796, |