Maximum-Severity GitLab Flaw Allowing Account Hijacking Under Active Exploitation

Dan Goodin reports via Ars Technica: A maximum severity vulnerability that allows hackers to hijack GitLab accounts with no user interaction required is now under active exploitation, federal government officials warned as data showed that thousands of users had yet to install a patch released in January. A change GitLab implemented in May 2023 made it possible for users to initiate password changes through links sent to secondary email addresses. The move was designed to permit resets when users didn't have access to the email address used to establish the account. In January, GitLab disclosed that the feature allowed attackers to send reset emails to accounts they controlled and from there click on the embedded link and take over the account. While exploits required no user interaction, hijackings worked only against accounts that weren't configured to use multi-factor authentication. Even with MFA, accounts remained vulnerable to password resets. The vulnerability, tracked as CVE-2023-7028, carries a severity rating of 10 out of a possible 10. The vulnerability, classified as an improper access control flaw, could pose a grave threat. GitLab software typically has access to multiple development environments belonging to users. With the ability to access them and surreptitiously introduce changes, attackers could sabotage projects or plant backdoors that could infect anyone using software built in the compromised environment. An example of a similar supply chain attack is the one that hit SolarWinds in 2021, infecting more than 18,000 of its customers. Other recent examples of supply chain attacks are here, here, and here. These sorts of attacks are powerful. By hacking a single, carefully selected target, attackers gain the means to infect thousands of downstream users, often without requiring them to take any action at all. According to Internet scans performed by security organization Shadowserver, more than 2,100 IP addresses showed they were hosting one or more vulnerable GitLab instances. In order to protect your system, you should enable MFA and install the latest patch. "GitLab users should also remember that patching does nothing to secure systems that have already been breached through exploits," notes Goodin.

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