CVE-2022-41916

Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT), as well as any third-party applications using Heimdal's libhx509. Users should upgrade to Heimdal 7.7.1 or 7.8. There are no known workarounds for this issue.

Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT), as well as any third-party applications using Heimdal's libhx509. Users should upgrade to Heimdal 7.7.1 or 7.8. There are no known workarounds for this issue.

Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT), as well as any third-party applications using Heimdal's libhx509. Users should upgrade to Heimdal 7.7.1 or 7.8. There are no known workarounds for this issue.

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)

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 libasn1-8-7.8.0-1.1 package on the GA media of openSUSE Tumbleweed.

It was discovered that Heimdal did not properly manage memory when normalizing Unicode. An attacker could possibly use this issue to cause a denial of service.