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CVE-2022-42898: Fix integer overflows in PAC parsing · krb5/krb5@ea92d2f
PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has “a similar bug.”
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Fix integer overflows in PAC parsing
In krb5_parse_pac(), check for buffer counts large enough to threaten integer overflow in the header length and memory length calculations. Avoid potential integer overflows when checking the length of each buffer. Credit to OSS-Fuzz for discovering one of the issues.
CVE-2022-42898:
In MIT krb5 releases 1.8 and later, an authenticated attacker may be able to cause a KDC or kadmind process to crash by reading beyond the bounds of allocated memory, creating a denial of service. A privileged attacker may similarly be able to cause a Kerberos or GSS application service to crash. On 32-bit platforms, an attacker can also cause insufficient memory to be allocated for the result, potentially leading to remote code execution in a KDC, kadmind, or GSS or Kerberos application server process. An attacker with the privileges of a cross-realm KDC may be able to extract secrets from a KDC process’s memory by having them copied into the PAC of a new ticket.
ticket: 9074 (new) tags: pullup target_version: 1.20-next target_version: 1.19-next
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