Description
VMime through 0.9.2 contains an information disclosure vulnerability in the uuEncoder::decode function that writes uninitialized stack memory into decoded output for over-long lines. Attackers can send a crafted uuencode or x-uuencode MIME part with a large line length byte to leak up to 15 bytes of stack contents per line in decoded attachments.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| kisli | vmime | ≤ 0.9.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | libvmime | No fix yet | — |
| Debian 12 | libvmime | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libvmime | No fix yet | — |
| Ubuntu 26.04 LTS | libvmime | No fix yet | — |
| Ubuntu 24.04 LTS | libvmime | No fix yet | — |
| Ubuntu 22.04 LTS | libvmime | No fix yet | — |
| Ubuntu 20.04 LTS | libvmime | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libvmime | No fix yet | — |
| Ubuntu 16.04 LTS | libvmime | No fix yet | — |
References
- Pull Request #363 issue-tracking patch
- Patch Commit patch
- https://github.com/kisli/vmime product
- https://github.com/kisli/vmime/blob/v0.9.2/src/vmime/utility/encoder/uuEncoder.cpp#L311 technical-description
- https://hackmd.io/@haindpwn/vmime-uuencode-decoder-oob-write third-party-advisory
- VulnCheck Advisory: VMime through 0.9.2 Uninitialized Stack Memory Disclosure via uuencode Decoder third-party-advisory