CVE-2020-29362

An integer overflow vulnerability was found in p11-kit. A local attacker, or one with access to a reachable RPC channel, can send specially crafted messages to cause miscalculated memory allocation for nested attributes. This leads to a heap out-of-bounds write, crashing the p11-kit RPC parsing process and resulting in a Denial of Service (DoS). The vulnerability is only exploitable on 32-bit systems.

A flaw was found in p11-kit where the RPC message attribute parsing functions lack recursion depth limits when processing nested template attributes. An unauthenticated attacker with local access to the Unix domain socket can send a crafted request causing stack exhaustion and crashing the p11-kit server and its dependent services.

A flaw was found in p11-kit where a remote attacker could call the C_DeriveKey function on a remote token with specific IBM kyber or IBM btc derive mechanism parameters set to NULL. This could lead to the RPC-client attempting to return an uninitialized value, potentially resulting in a NULL dereference or undefined behavior.

In p11-kit versions 0.23.6 through 0.23.21, a heap-based buffer overflow was discovered in the RPC protocol used by the server/remote commands and the client library. When a remote entity supplies a serialized byte array in a CK_ATTRIBUTE, the receiving entity may not allocate sufficient buffer length for the deserialized value.

In p11-kit versions 0.21.1 through 0.23.21, multiple integer overflows were discovered in array allocations in the p11-kit library and the p11-kit list command, where overflow checks are missing before calling realloc or calloc.