USN-5194-1: Olm vulnerability

15 December 2021

Olm could be made to crash or run programs if it received specially crafted input.

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Releases

Packages

  • olm - development files for the olm Double Ratchet implementation

Details

Denis Kasak discovered that Olm was not verifying the length of input being
processed by the olm_pk_decrypt module, which introduced a stack-based buffer
overflow vulnerability to the library. An attacker could use this to
cause a denial of service (application crash) or possibly execute arbitrary code.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04

In general, a standard system update will make all the necessary changes.

References

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Further reading