Bug#782561: Buffer overruns in Linux kernel RFC4106 implementation using AESNI

[cve-assign@mitre.org]

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> Linux kernel commit ccfe8c3f7e52 ("crypto: aesni - fix memory usage in
> GCM decryption") fixes two bugs in pointer arithmetic that lead to
> buffer overruns (even with valid parameters!):
> 
> https://git.kernel.org/linus/ccfe8c3f7e52ae83155cb038753f4c75b774ca8a
> https://bugs.debian.org/782561
> 
> These are described as resulting in DoS (local or remote), but are
> presumably also exploitable for privilege escalation.

> As the destination buffer for decryption only needs to hold the
> plaintext memory but cryptlen references the input buffer holding
> (ciphertext || authentication tag), the assumption of the destination
> buffer length in RFC4106 GCM operation leads to a too large size. ...
> In addition, ... cryptlen already includes the size of the tag. Thus,
> the tag does not need to be added.

Use CVE-2015-3331.

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CVE assignment team, MITRE CVE Numbering Authority
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