CyberRota Analysis
AI-GeneratedGNU wget is vulnerable to a denial of service attack due to improper handling of the FTP OPIE/S-KEY authentication sequence number, allowing a malicious FTP server to trigger excessive MD5 computations without upper limit validation. This can lead to significant CPU resource consumption, effectively suspending the application for an extended period. Organizations using wget for FTP operations should prioritize addressing this vulnerability to prevent potential service disruptions.
Original NVD Description
GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation. This issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa