Memcached vulnerabilities

The try_read_command function in memcached before version 1.4.39 allows remote attackers to cause a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read.

An integer overflow in the process_bin_sasl_auth function in Memcached can be exploited to cause heap overflow and lead to remote code execution.

Multiple integer overflows in the process_bin_update function in Memcached can be exploited to cause heap overflow and lead to remote code execution.

An integer overflow in the process_bin_append_prepend function in Memcached can be exploited to cause heap overflow and lead to remote code execution.

In memcached 1.6.41/1.6.42/1.6.43, the try_read_command_asciiauth function in proto_text.c (mcmc Tokenizer component) allows an out-of-bounds read. The attack can be launched remotely and the exploit has been publicly released. The fix is available in version 1.6.44 (commit af05c9302bba508b736c3da1d5670f63fe8b7db4).

Memcached before version 1.6.42 uses the memcmp function for password comparison in SASL authentication, causing a timing side-channel vulnerability. An attacker can read passwords by measuring response times.

In memcached before version 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by sasl_server_userdb_checkpass.