CVE-2021-31317

EUVD-2021-18227
Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Type Confusion in the VDasher constructor of their custom fork of the rlottie library. A remote attacker might be able to access Telegram's heap memory out-of-bounds on a victim device via a malicious animated sticker.
Type Confusion
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.5 MEDIUM
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 37%
Affected Products (NVD)
VendorProductVersion
telegramtelegram
𝑥
< 7.1.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
rlottie
bookworm
0.1+dfsg-4
fixed
bullseye
0.1+dfsg-2
fixed
sid
0.1+dfsg-4.2
fixed
trixie
0.1+dfsg-4.2
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
rlottie
bionic
dne
focal
needs-triage
groovy
ignored
hirsute
ignored
impish
ignored
jammy
needs-triage
kinetic
ignored
lunar
ignored
mantic
ignored
noble
needs-triage
trusty
dne
xenial
ignored
Common Weakness Enumeration
References
https://www.shielder.it/advisories/telegram-rlottie-vdasher-vdasher-type-confusion/
https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/
https://www.shielder.it/advisories/telegram-rlottie-vdasher-vdasher-type-confusion/
https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/