CVE-2022-3437

A heap-based buffer overflow vulnerability was found in Samba within the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal. The DES and Triple-DES decryption routines in the Heimdal GSSAPI library allow a length-limited write buffer overflow on malloc() allocated memory when presented with a maliciously small packet. This flaw allows a remote user to send specially crafted malicious data to the application, possibly resulting in a denial of service (DoS) attack.

A heap-based buffer overflow vulnerability was found in Samba within the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal. The DES and Triple-DES decryption routines in the Heimdal GSSAPI library allow a length-limited write buffer overflow on malloc() allocated memory when presented with a maliciously small packet. This flaw allows a remote user to send specially crafted malicious data to the application, possibly resulting in a denial of service (DoS) attack.

Samba is a suite of programs for Linux and Unix to interoperate with Windows.

Security Fix(es):

The DES (for Samba 4.11 and earlier) and Triple-DES decryption routines in the Heimdal GSSAPI library allow a length-limited write buffer overflow on malloc() allocated memory when presented with a maliciously small packet.

Affects - All versions of Samba since Samba 4.0 compiled with Heimdal Kerberos. Samba 4.15.11, 4.16.6 and 4.17.2 have been issued as security releases to correct the defect

https://www.samba.org/samba/security/CVE-2022-3437.html(CVE-2022-3437)

A heap-based buffer overflow vulnerability was found in Samba within the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal. The DES and Triple-DES decryption routines in the Heimdal GSSAPI library allow a length-limited write buffer overflow on malloc() allocated memory when presented with a maliciously small packet. This flaw allows a remote user to send specially crafted malicious data to the application, possibly resulting in a denial of service (DoS) attack.

• SECURITY UPDATE: heap-based buffer overflows in Heimdal ARC4 and DES3
  • debian/patches/CVE-2022-3437.patch: add extra NULL pointer and buffer boundaries checks, fix undefined behaviour and input data length calculations, remove accidentally duplicated code in arcfour.c
  • CVE-2022-3437

• SECURITY UPDATE: A heap-based buffer overflow vulnerability was found in Samba within the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal
  • debian/patches/CVE-2022-3437-1.patch: third_party/heimdal: use constant-time memcmp() for arcfour unwrap
  • debian/patches/CVE-2022-3437-3.patch: third_party/heimdal: check buffer length against overflow for DES{,3} unwrap
  • debian/patches/CVE-2022-3437-4.patch: third_party/heimdal: don't pass NULL pointers to memcpy() in DES unwrap
  • debian/patches/CVE-2022-3437-5.patch: third_party/heimdal: use constant-time memcmp() in unwrap_des3()
  • debian/patches/CVE-2022-3437-7.patch: third_party/heimdal: pass correct length to _gssapi_verify_pad()
  • debian/patches/CVE-2022-3437-8.patch: third_party/heimdal: check the result of _gsskrb5_get_mech()
  • debian/patches/CVE-2022-3437-9.patch: third_party/heimdal: remove func compatibility workaround
  • debian/patches/CVE-2022-3437-10.patch: third_party/heimdal: check for overflow in _gsskrb5_get_mech()
  • debian/patches/CVE-2022-3437-11.patch: third_party/heimdal: avoid undefined behaviour in _gssapi_verify_pad()
  • CVE-2022-3437

Isaac Boukris reported that the Heimdal KDC before 7.7.1 does not apply delegation_not_allowed (aka not-delegated) user attributes for S4U2Self. Instead the forwardable flag is set even if the impersonated client has the not-delegated flag set. (CVE-2019-14870)

Joseph Sutton discovered that the Heimdal KDC before 7.7.1 does not check for missing sname in TGS-REQ (Ticket Granting Server Request) before dereferencing. An authenticated user could use this flaw to crash the KDC. (CVE-2021-3671)

It was discovered that Heimdal is prone to a NULL dereference in acceptors when the initial SPNEGO token has no acceptable mechanisms, which may result in denial of service for a server application that uses the Simple and Protected GSSAPI Negotiation Mechanism (SPNEGO). (CVE-2021-44758)

Evgeny Legerov reported that the DES and Triple-DES decryption routines in the Heimdal GSSAPI library before 7.7.1 were prone to buffer overflow on malloc() allocated memory when presented with a maliciously small packet. In addition, the Triple-DES and RC4 (arcfour) decryption routine were prone to non-constant time leaks, which could potentially yield to a leak of secret key material when using these ciphers. (CVE-2022-3437)

It was discovered that Heimdal's PKI certificate validation library before 7.7.1 can under some circumstances perform an out-of-bounds memory access when normalizing Unicode, which may result in denial of service. (CVE-2022-41916)

Greg Hudson discovered an integer multiplication overflow in the Privilege Attribute Certificate (PAC) parsing routine, which may result in denial of service for Heimdal KDCs and possibly Heimdal servers (e.g., via GSS-API) on 32-bit systems. (CVE-2022-42898)

Douglas Bagnall and the Heimdal maintainers independently discovered that Heimdal's ASN.1 compiler before 7.7.1 generates code that allows specially crafted DER encodings of CHOICEs to invoke the wrong free() function on the decoded structure upon decode error, which may result in remote code execution in the Heimdal KDC and possibly the Kerberos client, the X.509 library, and other components as well. (CVE-2022-44640)

There is a limited write heap buffer overflow in the GSSAPI unwrap_des() and unwrap_des3() routines of Heimdal (included in Samba). Some SMB1 write requests were not correctly range checked to ensure the client had sent enough data to fulfill the write, allowing server memory contents to be written into the file (or printer) instead of client supplied data. The client cannot control the area of the server memory that is written to the file (or printer) (CVE-2022-3437)

A symlink following vulnerability was found in Samba, where a user can create a symbolic link that will make 'smbd' escape the configured share path. This flaw allows a remote user with access to the exported part of the file system under a share via SMB1 unix extensions or NFS to create symlinks to files outside the 'smbd' configured share path and gain access to another restricted server's filesystem. (CVE-2022-3592)

Active directory elevation of privilege vulnerability (CVE-2022-37966)

Active directory elevation of privilege vulnerability (CVE-2022-37967)

A flaw was found in samba. The Netlogon RPC implementations may use the rc4-hmac encryption algorithm, which is considered weak and should be avoided even if the client supports more modern encryption types. This issue could allow an attacker who knows the plain text content communicated between the samba client and server to craft data with the same MD5 calculation and replace it without being detected. (CVE-2022-38023)

Active directory integer overflow (CVE-2022-42898)

Active directory can be forced to issue weak rc4-hmac encrypted tickets (CVE-2022-45141)

This update for libheimdal fixes the following issues:

Update to version 7.8.0

• CVE-2022-42898 PAC parse integer overflows
• CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
• CVE-2022-41916 Fix Unicode normalization read of 1 bytes past end of array
• CVE-2021-44758 A null pointer de-reference DoS in SPNEGO acceptors
• CVE-2021-3671 A null pointer de-reference when handling missing sname in TGS-REQ
• CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec
• CVE-2019-14870: Validate client attributes in protocol-transition

This update for libheimdal fixes the following issues:

Update to version 7.8.0

• CVE-2022-42898 PAC parse integer overflows
• CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
• CVE-2022-41916 Fix Unicode normalization read of 1 bytes past end of array
• CVE-2021-44758 A null pointer de-reference DoS in SPNEGO acceptors
• CVE-2021-3671 A null pointer de-reference when handling missing sname in TGS-REQ
• CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec
• CVE-2019-14870: Validate client attributes in protocol-transition

These are all security issues fixed in the ctdb-4.17.2+git.273.a55a83528b9-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libasn1-8-7.8.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for samba fixes the following issues:

Version update to 4.15.12.

Security issues fixed:

• CVE-2022-2031: Fixed AD users that could have bypassed certain restrictions associated with changing passwords (bsc#1201495).
• CVE-2022-32742: Fixed SMB1 code that does not correctly verify SMB1write, SMB1write_and_close, SMB1write_and_unlock lengths (bsc#1201496).
• CVE-2022-32744: Fixed AD users that could have forged password change requests for any user (bsc#1201493).
• CVE-2022-32745: Fixed AD users that could have crashed the server process with an LDAP add or modify request (bsc#1201492).
• CVE-2022-32746: Fixed a use-after-free occurring in database audit logging (bsc#1201490).
• CVE-2022-3437: Fixed buffer overflow in Heimdal unwrap_des3() (bsc#1204254).
• CVE-2022-42898: Fixed Samba buffer overflow vulnerabilities on 32-bit systems (bsc#1205126).

Bug fixes:

• Install a systemd drop-in file for named service to allow read/write access to the DLZ directory (bsc#1201689).
• Possible use after free of connection_struct when iterating smbd_server_connection->connections (bsc#1200102).

This update for samba fixes the following issues:

• Updated to version 4.15.13:
  • CVE-2022-38023: Removed weak cryptographic algorithms from the Netlogon RPC implementation (bsc#1206504).
  • CVE-2022-42898: Fixed several buffer overflow vulnerabilities on 32-bit systems (bsc#1205126).
  • CVE-2022-3437: Fixed a buffer overflow in Heimdal unwrap_des3() (bsc#1204254).
  • CVE-2022-32742: Fixed an information disclosure issue affecting SMB1 servers (bsc#1201496).
  • CVE-2022-32746: Fixed a use-after-free occurring in database audit logging (bsc#1201490).
  • CVE-2022-2031: Fixed an AD restriction bypass associated with changing passwords (bsc#1201495).
  • CVE-2022-32745: Fixed a remote server crash that could be triggered with certain LDAP requests (bsc#1201492).
  • CVE-2022-32744: Fixed an issue where AD users could have forged password change requests on behalf of other users (bsc#1201493).

Other fixes:

• Fixed a potential crash due to a concurrency issue (bsc#1200102).

This update for samba fixes the following issues:

• CVE-2021-20251: Fixed an issue where the bad password count would not be properly incremented, which could allow attackers to brute force a user's password (bsc#1206546).

• Updated to version 4.15.13:

  • CVE-2022-37966: Fixed an issue where a weak cipher would be selected to encrypt session keys, which could lead to privilege escalation (bsc#1205385).
  • CVE-2022-37967: Fixed a potential privilege escalation issue via constrained delegation due to weak a cryptographic algorithm being selected (bsc#1205386).
  • CVE-2022-38023: Disabled weak ciphers by default in the Netlogon Secure channel (bsc#1206504).

• Updated to version 4.15.12:

  • CVE-2022-42898: Fixed several buffer overflow vulnerabilities on 32-bit systems (bsc#1205126).

• Updated to version 4.15.11:

  • CVE-2022-3437: Fixed a buffer overflow in Heimdal unwrap_des3() (bsc#1204254).

• Updated to version 4.15.10:

  • Fixed a potential crash due to a concurrency issue (bsc#1200102).

• Updated to version 4.15.9:

  • CVE-2022-32742: Fixed an information leak that could be triggered via SMB1 (bsc#1201496).
  • CVE-2022-32746: Fixed a memory corruption issue in database audit logging (bsc#1201490).
  • CVE-2022-2031: Fixed AD restrictions bypass associated with changing passwords (bsc#1201495).
  • CVE-2022-32745: Fixed a remote server crash that could be triggered with certain LDAP requests (bsc#1201492).
  • CVE-2022-32744: Fixed an issue where AD users could have forged password change requests on behalf of other users (bsc#1201493).

Other fixes:

• Fixed a problem when using bind as samba-ad-dc backend related to the named service (bsc#1201689).

It was discovered that Heimdal incorrectly handled certain SPNEGO tokens. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2021-44758)

Evgeny Legerov discovered that Heimdal incorrectly handled memory when performing certain DES decryption operations. A remote attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. (CVE-2022-3437)

Greg Hudson discovered that Kerberos PAC implementation used in Heimdal incorrectly handled certain parsing operations. A remote attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. (CVE-2022-42898)

It was discovered that Heimdal's KDC did not properly handle certain error conditions. A remote attacker could use this issue to cause a denial of service, or possibly execute arbitrary code. (CVE-2022-44640)

It was discovered that Samba incorrectly handled the bad password count logic. A remote attacker could possibly use this issue to bypass bad passwords lockouts. This issue was only addressed in Ubuntu 22.10. (CVE-2021-20251)

Evgeny Legerov discovered that Samba incorrectly handled buffers in certain GSSAPI routines of Heimdal. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2022-3437)

Tom Tervoort discovered that Samba incorrectly used weak rc4-hmac Kerberos keys. A remote attacker could possibly use this issue to elevate privileges. (CVE-2022-37966, CVE-2022-37967)

It was discovered that Samba supported weak RC4/HMAC-MD5 in NetLogon Secure Channel. A remote attacker could possibly use this issue to elevate privileges. (CVE-2022-38023)

Greg Hudson discovered that Samba incorrectly handled PAC parsing. On 32-bit systems, a remote attacker could use this issue to escalate privileges, or possibly execute arbitrary code. (CVE-2022-42898)

Joseph Sutton discovered that Samba could be forced to issue rc4-hmac encrypted Kerberos tickets. A remote attacker could possibly use this issue to escalate privileges. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-45141)

WARNING: The fixes included in these updates introduce several important behavior changes which may cause compatibility problems interacting with systems still expecting the former behavior. Please see the following upstream advisories for more information:

https://www.samba.org/samba/security/CVE-2022-37966.html https://www.samba.org/samba/security/CVE-2022-37967.html https://www.samba.org/samba/security/CVE-2022-38023.html

Evgeny Legerov discovered that Samba incorrectly handled buffers in certain GSSAPI routines of Heimdal. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2022-3437)

Tom Tervoort discovered that Samba incorrectly used weak rc4-hmac Kerberos keys. A remote attacker could possibly use this issue to elevate privileges. (CVE-2022-37966, CVE-2022-37967)

It was discovered that Samba supported weak RC4/HMAC-MD5 in NetLogon Secure Channel. A remote attacker could possibly use this issue to elevate privileges. (CVE-2022-38023)

Greg Hudson discovered that Samba incorrectly handled PAC parsing. On 32-bit systems, a remote attacker could use this issue to escalate privileges, or possibly execute arbitrary code. (CVE-2022-42898)

Joseph Sutton discovered that Samba could be forced to issue rc4-hmac encrypted Kerberos tickets. A remote attacker could possibly use this issue to escalate privileges. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-45141)

WARNING: This update upgrades the version of Samba to 4.15.13. Please see the upstream release notes for important changes in the new version:

https://www.samba.org/samba/history/samba-4.15.0.html

In addition, the security fixes included in this new version introduce several important behavior changes which may cause compatibility problems interacting with systems still expecting the former behavior. Please see the following upstream advisories for more information:

https://www.samba.org/samba/security/CVE-2022-37966.html https://www.samba.org/samba/security/CVE-2022-37967.html https://www.samba.org/samba/security/CVE-2022-38023.html

Evgeny Legerov discovered that Samba incorrectly handled buffers in certain GSSAPI routines of Heimdal. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2022-3437)

Greg Hudson discovered that Samba incorrectly handled PAC parsing. On 32-bit systems, a remote attacker could use this issue to escalate privileges, or possibly execute arbitrary code. (CVE-2022-42898)

Joseph Sutton discovered that Samba could be forced to issue rc4-hmac encrypted Kerberos tickets. A remote attacker could possibly use this issue to escalate privileges. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-45141)

Florent Saudel discovered that Samba incorrectly handled certain Spotlight requests. A remote attacker could possibly use this issue to cause Samba to consume resources, leading to a denial of service. (CVE-2023-34966)