Debian Security Advisory
DLA-2442-1 obfs4proxy -- LTS security update
- Date Reported:
- 10 Nov 2020
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2019-11840.
- More information:
golang-go.crypto was recently updated with a fix for CVE-2019-11840. This in turn requires all packages that use the affected code to be recompiled in order to pick up the security fix.
An issue was discovered in supplementary Go cryptography libraries, aka golang-googlecode-go-crypto. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.
For Debian 9 stretch, this problem has been fixed in version3 0.0.7-1+deb8u1.
We recommend that you upgrade your obfs4proxy packages.
For the detailed security status of obfs4proxy please refer to its security tracker page at: https://security-tracker.debian.org/tracker/obfs4proxy
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS