Xfinity waited 13 days to patch critical Citrix Bleed 0-day. Now it’s paying the price

Comcast waited 13 days to patch its community in opposition to a high-severity vulnerability, a lapse that allowed hackers to make off with password knowledge and different delicate data belonging to 36 million Xfinity prospects.

The breach, which was carried out by exploiting a vulnerability in community {hardware} bought by Citrix, gave hackers entry to usernames and cryptographically hashed passwords for 35.9 million Xfinity prospects, the cable TV and Web supplier stated in a notification filed Monday with the Maine legal professional common’s workplace. Citrix disclosed the vulnerability and issued a patch on October 10. Eight days later, researchers reported that the vulnerability, tracked as CVE-2023-4966 and by the identify Citrix Bleed, had been beneath active exploitation since August. Comcast didn’t patch its community till October 23, 13 days after a patch grew to become accessible and 5 days after the report of the in-the-wild assaults exploiting it.

“Nevertheless, we subsequently found that previous to mitigation, between October 16 and October 19, 2023, there was unauthorized entry to a few of our inside methods that we concluded was a results of this vulnerability,” an accompanying notice said. “We notified federal regulation enforcement and carried out an investigation into the character and scope of the incident. On November 16, 2023, it was decided that data was seemingly acquired.”

Comcast continues to be investigating exactly what knowledge the attackers obtained. Up to now, Monday’s disclosure stated, data recognized to have been taken contains usernames and hashed passwords, names, contact data, the final 4 digits of social safety numbers, dates of start, and/or secret questions and solutions. Xfinity is Comcast’s cable tv and Web division.

Citrix Bleed has emerged as one of many yr’s most extreme and extensively exploited vulnerabilities, with a severity ranking of 9.4 out of 10. The vulnerability, residing in Citrix’s NetScaler Software Supply Controller and NetScaler Gateway, could be exploited with none authentication or privileges on affected networks. Exploits disclose session tokens, which the {hardware} assigns to gadgets which have already efficiently supplied login credentials. Possession of the tokens permits hackers to override any multi-factor authentication in use and log into the system.

Different firms which were hacked via Citrix Bleed embrace Boeing; Toyota; DP World Australia, a department of the Dubai-based logistics firm DP World; Industrial and Business Financial institution of China; and regulation agency Allen & Overy.

The identify Citrix Bleed is an allusion to Heartbleed, a unique essential data disclosure zero-day that turned the Internet on its head in 2014. That vulnerability, which resided within the OpenSSL code library, got here beneath mass exploitation and allowed the pilfering of passwords, encryption keys, banking credentials, and every kind of different delicate data. Citrix Bleed hasn’t been as dire as a result of fewer weak gadgets are in use.

A sweep of probably the most energetic ransomware websites didn’t flip up any claims of duty for the hack of the Comcast community. An Xfinity consultant stated in an electronic mail that the corporate has but to obtain any ransom calls for, and investigators aren’t conscious of any buyer knowledge being leaked or of any assaults on affected prospects.

Comcast is requiring Xfinity prospects to reset their passwords to guard in opposition to the likelihood that attackers can crack the stolen hashes. The corporate can also be encouraging prospects to allow two-factor authentication. The consultant declined to say why firm admins did not patch sooner.