CosmicSting attack threatens 75% of Adobe Commerce stores

Sansec - experts in eCommerce security

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Sansec Forensics Team · 2024-06-18 · via Sansec - experts in eCommerce security

CosmicSting (aka CVE-2024-34102) is the worst bug to hit Magento and Adobe Commerce stores in two years. In itself, it allows anyone to read private files (such as those with passwords). However, combined with the recent iconv bug in Linux, it escalates into remote code execution. This critical bug grants full control to adversaries and the attack can be automated, which may lead to mass-hacks on a global scale. (Update July 1st: this is happening right now)

CVE	2024-34102
Type	unauthorized XXE, RCE together with CVE-2024-2961
Severity	CVSS 9.8
Automatable	no interaction needed
Exploit	verified by Sansec, not public yet
Credits	discoverd by spacewasp

"It's a bad one"

Its record severity score of 9.8 on the Common Vulnerability Scoring System (CVSS), a 10-point scale, prompted this Adobe statement:

It's a bad one and you should patch. It's likely only a matter of time before somebody posts an analysis and reproduction steps.

However, Adobe gave this issue the lowest possible severity rating ("install patch at your discretion"). Sansec believes this is a critical issue and merchants should take immediate action to prevent getting hacked.

Adobe issued a patch for CosmicSting attacks last week. While Adobe (naturally) did not share specifics of the attack, Sansec was able to reproduce the attack from the patch code. We believe bad actors are already working on the same.

For context: similarly critical security issues have occurred only three times before in Magento’s history:

At each of these occasions, tens of thousands of stores got hacked, sometimes within hours. So it is vital to upgrade your stores as soon as possible.

Attack patterns

As of June 27th, we see actual attack and mass scanning attempts in the wild. We collect and publish live CosmicSting attacker infrastructure and indicators of compromise here.

Upgrade concerns

Sansec - who monitors global eCommerce platforms - found that just 25% of stores have upgraded since the security release last week. A complicating factor is that the security release may break existing checkout functionality. Adobe backported the PCI-imposed CSP/SRI implemention from 2.4.7. This will likely break third party Javascript and inline scripts in your checkout flow. Sansec recommends switching to 'Report-Only' mode before upgrading. This way, your checkout will keep working, and you will have sufficient time to investigate incompatible modules before the new PCI requirements come into effect in April 2025.

It is also recommended to enable CSP monitoring. Sansec offers a free CSP monitoring service which you can setup in a few minutes.

Emergency fix

Previously Sansec provided an emergency fix, but as of June 27th, Adobe now provides an official, isolated security fix that can be applied all the way back to Magento 2.2.0, without having to upgrade. If you had previously applied the Sansec fix, we recommend to replace it with the the official Adobe patch.

We also stress that it is essential to rotate your encryption keys.

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Sansec - experts in eCommerce security

"It's a bad one"

Attack patterns

Upgrade concerns

Emergency fix

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