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libpam: fix CVE-2024-10963

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Pick up "Mitigated by" patch from Debian security tracker.
[0]: https://security-tracker.debian.org/tracker/CVE-2024-10963

patch[1] which fixes this vulnerability as mentioned in Debian report.

[1] 940747f88c

(From OE-Core rev: 5a9c3998d4924360e0c6a967adfc4b7628a6fa4e)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
[YC: Debian security tracker: "The vulnerable code was introduced in
1.5.3" but the vulnerable code was backported in commit 399d4986a7
(libpam: fix CVE-2022-28321, 2022-10-28)]
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
This commit is contained in:
Hitendra Prajapati 2026-03-05 17:38:34 +05:30 committed by Paul Barker
parent d8712ea143
commit 2e426aeb73
2 changed files with 230 additions and 0 deletions
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229
meta/recipes-extended/pam/libpam/CVE-2024-10963.patch Normal file
View File

@ -0,0 +1,229 @@
From f9ccee5c4c6cb0d4197b08ebeb36c1dceffe82e8 Mon Sep 17 00:00:00 2001
From: Thorsten Kukuk <kukuk@suse.com>
Date: Thu, 14 Nov 2024 10:27:28 +0100
Subject: [PATCH] pam_access: rework resolving of tokens as hostname
* modules/pam_access/pam_access.c: separate resolving of IP addresses
from hostnames. Don't resolve TTYs or display variables as hostname
(#834).
Add "nodns" option to disallow resolving of tokens as hostname.
* modules/pam_access/pam_access.8.xml: document nodns option
* modules/pam_access/access.conf.5.xml: document that hostnames should
be written as FQHN.
CVE: CVE-2024-10963
Upstream-Status: Backport [https://github.com/linux-pam/linux-pam/commit/940747f88c16e029b69a74e80a2e94f65cb3e628]
Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
---
modules/pam_access/access.conf.5.xml | 4 ++
modules/pam_access/pam_access.8.xml | 46 ++++++++++++------
modules/pam_access/pam_access.c | 72 +++++++++++++++++++++++++++-
3 files changed, 105 insertions(+), 17 deletions(-)
diff --git a/modules/pam_access/access.conf.5.xml b/modules/pam_access/access.conf.5.xml
index 8fdbc31..dc505a6 100644
--- a/modules/pam_access/access.conf.5.xml
+++ b/modules/pam_access/access.conf.5.xml
@@ -226,6 +226,10 @@
item and the line will be most probably ignored. For this reason, it is not
recommended to put spaces around the ':' characters.
</para>
+ <para>
+ Hostnames should be written as Fully-Qualified Host Name (FQHN) to avoid
+ confusion with device names or PAM service names.
+ </para>
</refsect1>
<refsect1 id="access.conf-see_also">
diff --git a/modules/pam_access/pam_access.8.xml b/modules/pam_access/pam_access.8.xml
index 9a6556c..eab9d9f 100644
--- a/modules/pam_access/pam_access.8.xml
+++ b/modules/pam_access/pam_access.8.xml
@@ -25,11 +25,14 @@
<arg choice="opt">
debug
</arg>
+ <arg choice="opt" rep="norepeat">
+ noaudit
+ </arg>
<arg choice="opt">
nodefgroup
</arg>
<arg choice="opt">
- noaudit
+ nodns
</arg>
<arg choice="opt">
accessfile=<replaceable>file</replaceable>
@@ -112,6 +115,33 @@
</listitem>
</varlistentry>
+ <varlistentry>
+ <term>
+ nodefgroup
+ </term>
+ <listitem>
+ <para>
+ User tokens which are not enclosed in parentheses will not be
+ matched against the group database. The backwards compatible default is
+ to try the group database match even for tokens not enclosed
+ in parentheses.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ nodns
+ </term>
+ <listitem>
+ <para>
+ Do not try to resolve tokens as hostnames, only IPv4 and IPv6
+ addresses will be resolved. Which means to allow login from a
+ remote host, the IP addresses need to be specified in <filename>access.conf</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term>
<option>fieldsep=<replaceable>separators</replaceable></option>
@@ -153,20 +183,6 @@
</listitem>
</varlistentry>
- <varlistentry>
- <term>
- <option>nodefgroup</option>
- </term>
- <listitem>
- <para>
- User tokens which are not enclosed in parentheses will not be
- matched against the group database. The backwards compatible default is
- to try the group database match even for tokens not enclosed
- in parentheses.
- </para>
- </listitem>
- </varlistentry>
-
</variablelist>
</refsect1>
diff --git a/modules/pam_access/pam_access.c b/modules/pam_access/pam_access.c
index bca424f..00a0a77 100644
--- a/modules/pam_access/pam_access.c
+++ b/modules/pam_access/pam_access.c
@@ -92,6 +92,7 @@ struct login_info {
int debug; /* Print debugging messages. */
int only_new_group_syntax; /* Only allow group entries of the form "(xyz)" */
int noaudit; /* Do not audit denials */
+ int nodns; /* Do not try to resolve tokens as hostnames */
const char *fs; /* field separator */
const char *sep; /* list-element separator */
int from_remote_host; /* If PAM_RHOST was used for from */
@@ -143,6 +144,8 @@ parse_args(pam_handle_t *pamh, struct login_info *loginfo,
loginfo->only_new_group_syntax = YES;
} else if (strcmp (argv[i], "noaudit") == 0) {
loginfo->noaudit = YES;
+ } else if (strcmp (argv[i], "nodns") == 0) {
+ loginfo->nodns = YES;
} else {
pam_syslog(pamh, LOG_ERR, "unrecognized option [%s]", argv[i]);
}
@@ -637,7 +640,7 @@ remote_match (pam_handle_t *pamh, char *tok, struct login_info *item)
if ((str_len = strlen(string)) > tok_len
&& strcasecmp(tok, string + str_len - tok_len) == 0)
return YES;
- } else if (tok[tok_len - 1] == '.') { /* internet network numbers (end with ".") */
+ } else if (tok[tok_len - 1] == '.') { /* internet network numbers/subnet (end with ".") */
struct addrinfo hint;
memset (&hint, '\0', sizeof (hint));
@@ -712,6 +715,39 @@ string_match (pam_handle_t *pamh, const char *tok, const char *string,
}
+static int
+is_device (pam_handle_t *pamh, const char *tok)
+{
+ struct stat st;
+ const char *dev = "/dev/";
+ char *devname;
+
+ devname = malloc (strlen(dev) + strlen (tok) + 1);
+ if (devname == NULL) {
+ pam_syslog(pamh, LOG_ERR, "Cannot allocate memory for device name: %m");
+ /*
+ * We should return an error and abort, but pam_access has no good
+ * error handling.
+ */
+ return NO;
+ }
+
+ char *cp = stpcpy (devname, dev);
+ strcpy (cp, tok);
+
+ if (lstat(devname, &st) != 0)
+ {
+ free (devname);
+ return NO;
+ }
+ free (devname);
+
+ if (S_ISCHR(st.st_mode))
+ return YES;
+
+ return NO;
+}
+
/* network_netmask_match - match a string against one token
* where string is a hostname or ip (v4,v6) address and tok
* represents either a hostname, a single ip (v4,v6) address
@@ -773,10 +809,42 @@ network_netmask_match (pam_handle_t *pamh,
return NO;
}
}
+ else if (isipaddr(tok, NULL, NULL) == YES)
+ {
+ if (getaddrinfo (tok, NULL, NULL, &ai) != 0)
+ {
+ if (item->debug)
+ pam_syslog(pamh, LOG_DEBUG, "cannot resolve IP address \"%s\"", tok);
+
+ return NO;
+ }
+ netmask_ptr = NULL;
+ }
+ else if (item->nodns)
+ {
+ /* Only hostnames are left, which we would need to resolve via DNS */
+ return NO;
+ }
else
{
+ /* Bail out on X11 Display entries and ttys. */
+ if (tok[0] == ':')
+ {
+ if (item->debug)
+ pam_syslog (pamh, LOG_DEBUG,
+ "network_netmask_match: tok=%s is X11 display", tok);
+ return NO;
+ }
+ if (is_device (pamh, tok))
+ {
+ if (item->debug)
+ pam_syslog (pamh, LOG_DEBUG,
+ "network_netmask_match: tok=%s is a TTY", tok);
+ return NO;
+ }
+
/*
- * It is either an IP address or a hostname.
+ * It is most likely a hostname.
* Let getaddrinfo sort everything out
*/
if (getaddrinfo (tok, NULL, NULL, &ai) != 0)
--
2.50.1

1
meta/recipes-extended/pam/libpam_1.5.2.bb
View File

@ -34,6 +34,7 @@ SRC_URI = "https://github.com/linux-pam/linux-pam/releases/download/v${PV}/Linux
file://CVE-2025-6020-01.patch \
file://CVE-2025-6020-02.patch \
file://CVE-2025-6020-03.patch \
file://CVE-2024-10963.patch \
"
SRC_URI[sha256sum] = "e4ec7131a91da44512574268f493c6d8ca105c87091691b8e9b56ca685d4f94d"