Vulnerability · Published Aug 13, 2021 · Assigned by talos
CVE-2021-21814
High 7.8
In plain English
A high-severity security flaw in AT&T. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Official description
Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to strlen to determine the ending location of the char* passed in by the user, no checks are done to see if the passed in char* is longer than the staticly sized buffer data is memcpy‘d into, but after the memcpy a null byte is written to what is assumed to be the end of the buffer to terminate the char*, but without length checks, this null write occurs at an arbitrary offset from the buffer. An attacker can provide malicious input to trigger this vulnerability.
Affected products (as reported)
References
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1280 x_refsource_MISC