CVE-2021-42258

BQE BillQuick Web Suite 2018 through 2021 before 22.0.9.1 allows SQL injection for unauthenticated remote code execution, as exploited in the wild in October 2021 for ransomware installation. SQL injection can, for example, use the txtID (aka username) parameter. Successful exploitation can include the ability to execute arbitrary code as MSSQLSERVER$ via xp_cmdshell.

Recent assessments:

space-r7 at November 16, 2021 4:45pm UTC reported:

Exploitation is fairly trivial, but dumping all of the useful tables gets more involved. As @NinjaOperator mentioned, this vulnerability has been used to deploy ransomware in the past, so I’m rating this as fairly high in terms of exploitability. The documentation for BillQuick setup and installation uses the sa user’s credentials, meaning that it’s likely that customers are doing the same. Attackers can go further with this vulnerability and achieve code execution as a result of this. I’m not aware of any public PoC for achieving RCE with this vuln, but patching should be prioritized.

NinjaOperator at October 28, 2021 6:22pm UTC reported:

Exploitation is fairly trivial, but dumping all of the useful tables gets more involved. As @NinjaOperator mentioned, this vulnerability has been used to deploy ransomware in the past, so I’m rating this as fairly high in terms of exploitability. The documentation for BillQuick setup and installation uses the sa user’s credentials, meaning that it’s likely that customers are doing the same. Attackers can go further with this vulnerability and achieve code execution as a result of this. I’m not aware of any public PoC for achieving RCE with this vuln, but patching should be prioritized.

Assessed Attacker Value: 4
Assessed Attacker Value: 4Assessed Attacker Value: 4