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by botplaysdice 1321 days ago
quick question, I didn't look into the detail of the issue and novice on Rust as well - question is to whom already checked detail of the vulnerability, is this bug kind of ones we can prevent if we're using Rust instead of C?
1 comments
formerly_proven 1321 days ago
Bog standard buffer overflow caused by incorrect bounds checking. Yes.
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nequo 1321 days ago
Indeed. For illustration, the Ubuntu commits that fix the two CVEs:

https://git.launchpad.net/ubuntu/+source/openssl/commit/?h=a...

  -        if (written_out > max_out)
  +        if (written_out >= max_out)

  [...]
https://git.launchpad.net/ubuntu/+source/openssl/commit/?id=...

  -            if (tmpptr != NULL)
  -                PUSHC('.');
  +            PUSHC(tmpptr != NULL ? '.' : '\0');

  -    char a_ulabel[LABEL_BUF_SIZE];
  +    char a_ulabel[LABEL_BUF_SIZE + 1];
https://git.launchpad.net/ubuntu/+source/openssl/commit/?id=...

  -            || type->origin == EVP_ORIG_METH) {
  +            || (type != NULL && type->origin == EVP_ORIG_METH)
  +            || (type == NULL && ctx->digest != NULL
  +                             && ctx->digest->origin == EVP_ORIG_METH)) {

  -            || impl != NULL) {
  +            || impl != NULL
  +            || (cipher != NULL && cipher->origin == EVP_ORIG_METH)
  +            || (cipher == NULL && ctx->cipher != NULL
  +                               && ctx->cipher->origin == EVP_ORIG_METH)) {
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