[glibc/release/2.36/master] Document CVE-2023-4806 and CVE-2023-5156 in NEWS

[glibc/release/2.36/master] Document CVE-2023-4806 and CVE-2023-5156 in NEWS

[Siddhesh Poyarekar]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=32957eb6a86acdbeec9f38a60a7d5a0ff32db03d

commit 32957eb6a86acdbeec9f38a60a7d5a0ff32db03d
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Tue Sep 26 07:38:07 2023 -0400

    Document CVE-2023-4806 and CVE-2023-5156 in NEWS
    
    These are tracked in BZ #30884 and BZ #30843.
    
    Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
    (cherry picked from commit fd134feba35fa839018965733b34d28a09a075dd)

Diff:
---
 NEWS | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/NEWS b/NEWS
index 8923c70820..ae55ffb53a 100644
--- a/NEWS
+++ b/NEWS
@@ -27,6 +27,15 @@ Security related changes:
   2048 bytes, getaddrinfo may potentially disclose stack contents via
   the returned address data, or crash.
 
+  CVE-2023-4806: When an NSS plugin only implements the
+  _gethostbyname2_r and _getcanonname_r callbacks, getaddrinfo could use
+  memory that was freed during buffer resizing, potentially causing a
+  crash or read or write to arbitrary memory.
+
+  CVE-2023-5156: The fix for CVE-2023-4806 introduced a memory leak when
+  an application calls getaddrinfo for AF_INET6 with AI_CANONNAME,
+  AI_ALL and AI_V4MAPPED flags set.
+
 The following bugs are resolved with this release:
 
   [12154] Do not fail DNS resolution for CNAMEs which are not host names