UBUNTU-CVE-2023-0286
There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag), this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call, enabling them to read memory contents or enact a denial of service. In most cases, the attack requires the attacker to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one of these inputs, the other input must already contain an X.400 address as a CRL distribution point, which is uncommon. As such, this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.
02 / AFFECTED SOFTWARE
Affected packages
25 explicit affected versions
14 explicit affected versions
15 explicit affected versions
18 explicit affected versions
13 explicit affected versions
7 explicit affected versions
10 explicit affected versions
34 explicit affected versions
7 explicit affected versions
30 explicit affected versions
12 explicit affected versions
12 explicit affected versions
6 explicit affected versions
10 explicit affected versions
7 explicit affected versions
2 explicit affected versions
2 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag), this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call, enabling them to read memory contents or enact a denial of service. In most cases, the attack requires the attacker to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one of these inputs, the other input must already contain an X.400 address as a CRL distribution point, which is uncommon. As such, this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2023-0286
- https://ubuntu.com/security/notices/USN-5844-1
- https://ubuntu.com/security/notices/USN-5845-1
- https://ubuntu.com/security/notices/USN-5845-2
- https://ubuntu.com/security/notices/USN-6564-1
- https://ubuntu.com/security/notices/USN-7894-1
- https://www.cve.org/CVERecord?id=CVE-2023-0286
- https://www.openssl.org/news/secadv/20230207.txt