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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/NEWS b/NEWS index 40f8c90853..f1abb662b0 100644 --- a/NEWS +++ b/NEWS @@ -11,6 +11,20 @@ Version 2.21.1 17269, 17905, 17949, 18007, 18032, 18240, 18287, 18694, 18887, 18985. +* 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) + * 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 |